A garden plant as symbol of the Japanese Nation

In ancient Japan cherry planting had become a symbolic action for claiming power. This began in the ninth century when the emperor planted a cherry in front of his palace to replace a Chinese style plum. After power systems had shifted from emperors to shoguns the practice remained. In the old capital of Kyoto a new shogun brought in cherries from the Yoshino Mountain, south of the city where the emperor was exiled. Planting these Yoshino cherries at an imperial garden in Kyoto obviously asserted territorial claims. Botanically speaking these were wild Japanese Mountain Cherries (Kuitert Reference Kuitert1999, 44–53; Kuitert Reference Kuitert, Conan and Kress2007, 135).

For a new feudal dynasty of shoguns, a capital city was founded in 1603. The city was named Edo and the shogun’s dynasty is often referred to as the Edo Period. In the newly established capital Edo, it was self-evident that the shogun would plant Yoshino cherries. Thus wild Japanese Mountain Cherries—not brought in from the famous and far away Yoshino Mountain but locally grown from seed—came to be planted deliberately in urban areas that needed to be controlled. Throughout the Edo period, planting occurred along strategic rivers and irrigation canals and also around a Kan’ei-ji Temple, north-east of the shogun’s main castle. According to superstition, the north-east was believed to generate evil influence; the temple with its cherries mitigated this and protected the shogun (Kuitert Reference Kuitert1999, 69). After the last feudal shogun stepped down in 1867, the Kan’ei-ji Temple buildings were burnt in the troubles that accompanied the downfall of the shogun’s government. Most likely the cherries also suffered. But Edo became modern Tokyo and the Kan’ei-ji Temple grounds were under a new Tokyo administration and turned into a public space, the Ueno Park. A park survey over the years 1885 and 1886 brought different cherries—not Japanese Mountain Cherries—in focus; these had recently been transplanted by a gardener as “Yoshino” cherry, a name that functioned as a marketing strategy, because of the fame of the mountain. ^{Footnote 6} This “Yoshino” had been propagated by the thousands as a clone and, as it quickly grows into a proper tree, it must have helped to reestablish the fame of the Ueno cherry blossoms whose symbolism had been so important for its urban planning. But since these were not from the Yoshino Mountain and had been brought in by a gardener from a nursery village Somei, the park survey took them as “Somei-yoshino”—which is still the name by which the Tokyo Cherry is well-known in Japan today. Years later, in 1900, this vernacular name was published in a horticultural magazine (Fujino Reference Fujino1900).

The shogun’s castle, protected by the Kan’ei-ji Temple with its cherries, was now the palace of the new Meiji Emperor secured by institutions of the new state. In the Ueno Park, with its Tokyo Cherries on the revered grounds, a brand-new National Museum, Zoo, and National Museum of Nature and Science were all guiding the emperor and the nation towards modernity. Setting up and managing of modern inventories of useful plants were the task of new administrators. Among them was Tanaka Yoshio (1838–1916) a magnate and plantsman, also one of the founders of this last Museum. He was responsible for such early inventories, where the Tokyo Cherry was headed under the Japanese Mountain Cherry (Agricultural 1895, 134–135). Cherries of symbolic significance could only be endemic Japanese Mountain Cherries, and not garden hybrids as feudal scholarship had indicated. ^{Footnote 7} That was simply common sense among all Japanese, including the Somei gardener who had brought his “Yoshino,” named as if it was an endemic specimen. Later however, Tanaka suspected it to be some form of the Ōshima Cherry (Makino Reference Makino1926, 8), a tree not endemic in Japan’s mountains, but on the islands and coasts of the Izu region. The tone was set: this could not be an uneasy clonal cherry from some servile gardener, but should be a native plant from the wild.

The issue of the Tokyo Cherry’s homeland, so important in embellishing the institutions of the new state and, by extension, protecting the emperor, would be settled by botanical science—another new tool for nation building. The tree’s provenance and identity were established by the botanist Matsumura Jinzō (1856–1928). As a university assistant, Matsumura had helped his professor collect specimens from all over the country, and had published a first inventory list of the plants of Japan (Matsumura Reference Matsumura1884). He had been working in the Koishikawa Botanical Garden for many years before he became the first official director in 1897. He proved to be a prolific writer of species descriptions in Latin, describing twenty-eight species—an average of more than two per month—in 1901 (IPNI 2019). Among these is the Tokyo Cherry, where Matsumura gave it the new Latin name of Prunus yedoensis (see figure 1). ^{Footnote 8} Using Linnaean binominal nomenclature, he indexed a gardener’s clone from Somei, a feudal village, under the Prunus umbrella of modern international botany, befitting the new capital with a new species adorned with an epithet yedoensis—indicating that it is a cherry from feudal Edo, also spelled as Yedo. Prunus yedoensis in an English translation is “Tokyo Cherry.”

Figure 1. The Tokyo Cherry proposed as species; description by Matsumura Jinzō. From Matsumura (Reference Matsumura1901).

Matsumura noted in his description of the Tokyo Cherry that it is extensively cultivated in the gardens of Tokyo. He distinguished it clearly from the wild Japanese Mountain Cherry pointing to morphological details, and added that its origin is unknown, but it is said to have been brought from the island Ōshima in the province of Izu. The island is known for its Ōshima Cherries, which do indeed bear some resemblance to the Tokyo Cherry. Matsumura made his description from a set of Tokyo Cherries planted in 1875 in rows on a lawn by the head gardener who had procured these plants as root suckers from a very old Tokyo Cherry elsewhere in the garden (see figure 2). ^{Footnote 9} One of his students in posthumous praise said “This cherry has a most striking appearance compared to all others, as was brought to a complete understanding among the botanists, when in 1901 professor Matsumura named it as Prunus yedoensis MATSUM.” (Koidzumi Reference Koidzumi1932a, 177).

Figure 2. Spring under Tokyo Cherries in the Koishikawa Botanical Garden. Trees are regrowths after the devastating 1945 air raids from the earlier trees seen in Figure 3. Koishikawa Botanical Garden, Tokyo. Photo by author, March 31, 2019.

What is nonetheless striking is that the Tokyo Cherry had already been described as a cultivated plant the previous year in a horticultural magazine, albeit not in authoritative international botanic Latin. Moreover, it had been cloned as a garden plant within his own Botanical Garden, but Matsumura added a dubious provenance by suggesting it was a wild Ōshima Cherry. Yet he remained vague as his status as scientist was at stake. It is telling to see how Matsumura began to feel uncomfortable with the mushrooming symbolic importance of the Tokyo Cherry a few years later.

Cherries had been important garden plants for the feudal elite, but near the end of the nineteenth century, through purposeful policy procedures, they became plants for the masses and a propaganda tool for the intense nationalism and militarism of the modern government. A yearly Cherry Viewing Party supervised by the emperor himself commenced from 1881 onwards, further intensifying the cherries’ educational message (Ama Reference Ama1991, 2–5). Entering the twentieth century, the popularity of the Tokyo Cherry quickly rose outside Tokyo as well (Makino Reference Makino1933). After Japan had won the war with Russia in 1905, amidst the excitement of national pride, parks nationwide were adorned with the easily propagated, and now mass-produced and spectacularly flowering Tokyo Cherries. These were often planted around the memorials celebrating events (Matsumura Reference Matsumura1906; Sano Reference Sano1998, 95). Militarism had also stressed the strategic importance of the Korean peninsula, where the Japanese navy established a naval port at Jinhae. Tokyo Cherries were planted massively in this port city starting in 1906 and, in following decades, all over Korea (Korea Institute 1998, 22; Hwang Reference Hwang2007, 26). Jinhae happens to have a mild climate, and its cherries are almost the first ones in all of Korea to flower, heralding the wave of blossoms that spreads over the peninsula each spring (Korea Institute 1998, 20). This must have given intense and added feelings of pride and possession to the Japanese involved. Militarist agitation blended with emotions of imperialist progress that clung to the aesthetics of the Nation’s Flower.

Matsumura, in his essay “Notes on Cherries,” expressed his irritation at the general public, who do not differentiate this Nation’s Flower from the various other cherries and simply see all of them as beautiful. The real Japanese, he argued, should appreciate the refined elegance of the native Japanese Mountain Cherry rather than the vulgar and voluptuous beauty of the Tokyo Cherry (Matsumura Reference Matsumura1906). Miyoshi Manabu (1861–1939), a conservative cherry scholar, felt the same, arguing that the cloned Tokyo Cherry not only offers no fodder for research, but also has no aesthetic merit, as each individual specimen is the same (Miyoshi Reference Miyoshi1920a, 11). Miyoshi did not address the Tokyo Cherry at all in his monograph (Miyoshi Reference Miyoshi1916). But Matsumura had seen herbarium specimens from flowering cherries in Europe that were collected not only from Japan, but also from Yunnan in China and the Himalayas in India. Although he understood that cherries could hardly be seen as plants unique to Japan, he succumbed to political correctness and praised their refined elegance as part of classic Japanese aesthetics (Mito 2014).

In “Notes on Cherries,” Matsumura referred to the Tokyo Cherry not as “Somei-yoshino” but as Takigi-zakura (Matsumura Reference Matsumura1906), a name that translates as the Charcoal Cherry and is another folk name for the Ōshima Cherry. Obviously referring back to his earlier suggestion for the provenance, Matsumura stressed once more that he thought the Tokyo Cherry was some form of the Ōshima Cherry rather than a nursery product. It seems that for Matsumura, the idea that it was a gardeners’ bastard, and not a pure wild, indigenous species may have been indigestible. However, there was simply no return from the mushrooming popularity of the Nation’s Flower. Ten years later, in the international arena, this Ōshima Cherry was indeed understood as one of the parent species of the hybrid Tokyo Cherry by British plant hunter Ernest Henry Wilson (1876–1930). The other parent, according to him was a Higan Cherry, a judgement that he derived from botanical details, such as pubescence, growing habits and the like (Wilson Reference Wilson1916, 15–17). Wilson was well-informed on Japanese flowering cherries through various local experts, including gardeners, nursery men, and horticulturalists (Koehne Reference Koehne1917, 1) and they will have helped him to reach at a more realistic classification. Wilson’s statement could not be ignored, but it was decades before Japanese scientists picked it up.

Yamato in Korea, an imperial hybrid as species

Matsumura’s conjecture that the Nation’s Flower cannot be a nursery product, but should be classified correctly as a true, wild species was realized during the imperialist conquest of Korea. Exploring the new land not only provided botanists with mouth-watering chances to discover and describe new plants (Mori Reference Mori1922, 2–3), but it also slid the cherry discourse smoothly into cultural policies towards a unified colonial empire. ^{Footnote 10}

The plantsmen of Japan, joined by two Frenchmen and a German, all scrambled for what seemed a second and different Tokyo Cherry found in an outermost corner of the expanding empire, on Jeju Island (known as Quelpaert until 1910) off the southern tip of the Korean peninsula. An herbarium specimen of this Jeju cherry reached Emil Koehne (1848–1918), a German dendrologist and good botanic draftsman who was preparing a publication on Japanese cherries (Harms Reference Harms1919; Koehne Reference Koehne1917; Pax Reference Pax1918). The specimen resembled the Tokyo Cherry that he had studied since one was planted in the Berlin arboretum in 1900 (Koehne Reference Koehne1917, 39–40). Now, imagining this single herbarium specimen as a representative of many identical trees in a wider area, Koehne proposed a new regional variety nudiflora, headed under P. yedoensis (Koehne Reference Koehne1911/12). Matsumura’s hopeful aspiration that P. yedoensis itself was a species and not a cultivated clone was, with its variety P. yedoensis var. nudiflora corroborated, at least on paper and in a respectable international scientific paper in Latin.

The herbarium consulted by Koehne had been collected by French amateur botanist Émile Taquet (1873–1952) who had been put in charge as a Catholic missionary on Jeju island in 1902. It was just after a massacre of Christians and naturally proselytizing efforts were slow. With time to travel, Taquet started observing and collecting plants, and sending herbarium specimens out (IRFA 2020a). He found inspiration and encouragement for his efforts in his respected senior colleague Urbain Faurie (1847–1915). Faurie too was a French missionary, and had settled in northern Japan two decades earlier. But as hearts of the Japanese were stubbornly closed to Christianity he found solace in botany and, from the 1880s onwards, was botanizing (IRFA 2020b). Faurie had visited Jeju Island once (Kakuta Reference Kakuta1992, 70), but the visit was too short to fully explore its natural wealth, the product of its generous climate conditions. Now, however, the floral abundance of the island was in Taquet’s reach every day, and he could send out numerous herbarium specimens. The specimens included material of several cherries that were growing high up on the slopes of the Halla Mountain behind his church village Sohong-ni on southern Jeju where he lived. On April fourteenth, 1908, Taquet numbered three specimens from the same cherry as 4638 and it was one of these that Koehne studied. ^{Footnote 11}

Koehne’s report likely did not amuse Faurie. Being a staunch nationalist and having personal experiences in the war with Prussia, Faurie hated anything German (Hayata Reference Hayata1916, 270; Kitamura Reference Kitamura1979, 94) and perhaps he was aware that Koehne had been wounded quite severely in the Battle of Metz (Harms Reference Harms1919, 74–75). Ignoring Koehne, Faurie addressed a young Japanese botanist and student of Matsumura. This was Koidzumi Gen’ichi (1883–1953) (Hisauchi Reference Hisauchi1954; Kitamura Reference Kitamura1954, Reference Kitamura1982). Having seen Taquet’s herbarium at Faurie’s, and another Japanese botanist’s suggestion, Koidzumi published a miscellaneous and short note that the natural habitat of the Tokyo Cherry is Jeju Island (Koidzumi Reference Koidzumi1913a, 395). Despite of lacking data and argument this note was quoted by Miyoshi (Miyoshi Reference Miyoshi1916, 23). ^{Footnote 12} And although Koidzumi was corresponding with Koehne (Koehne Reference Koehne1917, 1), he did not refer to Koehne’s classification published the year before.

To the Japanese, the meaning of Korea and of cherries had by now evolved significantly. After being taken as a protectorate in 1905, the peninsula was fully annexed by Japan in 1910. Meanwhile, cherries had become a powerful state gift, after more than six thousand had been shipped to the USA at the wish of the first lady Helen Taft in February 1912, setting a tradition of American blossom festivals (Jefferson and Fusoni Reference Jefferson and Fusoni1977). More than ever before, cherries were a symbol of Japan’s Empire, precisely expressed by Nitobe: “it is still a living object of power and beauty among us” and also illustrated with his poem “Isles of blest Japan!/Should your Yamato spirit/Strangers seek to scan,/Say - scenting morn’s sun-lit air,/Blows the cherry wild and fair!” (Nitobe [1899] Reference Nitobe1900, 1, 109–111).

In a full overview of the Rosaceae in Japan, Koidzumi gave Matsumura’s Tokyo Cherry an extensive new description in Latin, updating its scientific status. He added that it is commonly cultivated, and that Jeju Island is its natural area of distribution, without any reference to Koehne’s nudiflora. In Koidzumi’s overview, the only illustrative photos are of flowering twigs of a few other Japanese cherries, yet strikingly, the Tokyo Cherry gets a page-wide photo of the trees in blossom in the Koishikawa Botanical Garden (see figure 3). It also receives a new and telling nomen novum: “Yamato-sakura” (Koidzumi Reference Koidzumi1913b, 263–264, followed by Koehne Reference Koehne1917, 38). Nationalist qualities of the Tokyo Cherry could hardly have been brought further than this, as Yamato was a heavily laden nominator for the true, native Japanese people, including their history, territory, their pure blood, and their samurai fighting spirit. This Yamato Cherry was naturally distributed in Korea.

Figure 3. A page-wide photo of the set of Tokyo Cherries in the Koishikawa Botanical Garden accompanies Koidzumi’s extensive Latin description of his Prunus yedoensis, “Yamato-sakura”. From Koidzumi (Reference Koidzumi1913b).

The exploration of the whole flora of Korea, by order of the Japanese government, had begun in 1906. Another young and brilliant student of Matsumura was engaged for this project—Nakai Takenoshin (1882–1952) (Nakai Reference Nakai1927; Lee Reference Lee2015, 668). Nakai became the foremost specialist on Korean botany (Hara Reference Hara1953) and, by order of the Japanese colonial government in Korea, he reported on the Jeju cherry in his Flora Sylvatica Koreana. ^{Footnote 13} An extensive text, it explores the problem of how this cherry could ever have reached Japan in feudal times, but ultimately states that the Tokyo Cherry is wild (not native) but rare in Jeju. The abstract, written in international Latin, also quotes Koehne’s nudiflora as living in the forests of Jeju. This is followed by a note that this plant is common in gardens of the Japanese, and is said to have stemmed from the gardens of Somei in olden times, while the Ōshima Island is not its home because that only has the Ōshima Cherry (Nakai Reference Nakai1915, 141; Reference Nakai1916, 9–10, 24–25). On this latter point, Nakai introduces a minor critique on his teacher, professor Matsumura. On the whole, however, Nakai constructed, supported by Koidzumi, a learned classification for the Nation’s Flower as being a wild species in Korea, bolstering the imperialist meaning of Japan’s cherries for colonial politics.

The First World War brought further economic prosperity to Japan, while commercial fairs advertised colonial wealth. But the self-confidence about the greater imperialist purpose also led to thoughts of independence and resistance in Korea. Cultural policies were increasingly required to back up colonial rule, in which the Tokyo Cherry played a key role. From 1933, school text books took the cherry as a main theme for teaching primary school kids Japanese language, or middle schoolers biology (Kuitert Reference Kuitert1999, 94–96, 135). At the same time, more general or popular-science plant books unequivocally explained the Tokyo Cherry as being a wild plant of Korea’s native flora (Mori Reference Mori1922, 212; Makino et al. Reference Makino and Kanji1931, 500; Uyeki Reference Uyeki1933, 84). Cherries were planted by the thousands (Kim Reference Kim2011, 127–133) and blossom festivities were promoted more effectively. The Tokyo Cherries were an innovative propaganda tool in the new botanical garden of Seoul, which had been set up in one of the former royal palaces. From 1924 onwards, the flowers were celebrated with electric illumination and night-time festivities (Kim Reference Kim2017, 180–183). Particularly these cherries were seen as having “a role in the establishing of Our Land” (Ishidoya Reference Ishidoya1929, 67).

The Bureau of Forestry of the Japanese colonial government of Korea also advertised the Jeju hypothesis, suggesting that an original tree could have been brought by ship to Japan in remote history (Ishidoya Reference Ishidoya1929). This announcement was made by Ishidoya Tsutomu (1884–1958) a staff member who was also teaching at the Imperial University in Seoul. ^{Footnote 14} On a late afternoon in April 1932, Koidzumi arrived in person as the first true plant scientist to verify the cherry flowers of amateur Taquet on the higher slopes of Halla Mountain in Jeju. Guided by Ishidoya and the staff of the Bureau, he was shown what they thought to be the real and wild Tokyo Cherry. Blatantly wrong, but in full triumph, Koidzumi claimed to have seen a real Tokyo Cherry on a mountain walk in Jeju in a miscellaneous essay that was published shortly after his visit (Koidzumi Reference Koidzumi1932a). Conveniently, this time he does quote Koehne (Reference Koehne1911/12) as an important authority proving that the Tokyo Cherry is endemic (not wild, and not natural) on Jeju Island, although its phyto-geography remained problematic: why should this garden plant cherished in Tokyo be on the slopes of a mountain in Jeju? The solution that Koidzumi proposed was again a tree resembling the Tokyo Cherry, Prunus sacra, that had been discovered earlier (Miyoshi Reference Miyoshi1920b, 168–169). Koidzumi suggested that this sacred cherry found at an old temple in the Yoshino Mountain in the Yamato Province must have been the one that had arrived by ship from Jeju at the end of the feudal dynasties in tandem with the Tokyo Cherry, from which the latter then had arrived in Edo as “Yoshino” (Koidzumi Reference Koidzumi1932a, 179).

The Jeju hypothesis for the Tokyo Cherry now fully endorsed the status and ambitions of imperialist Japan:

Although it is easy in retrospect to see through the proposals of Koidzumi and Nakai, both were highly respected as corresponding members and visitors of eminent international scientific institutions, and both were employed in reputable imperial universities performing at an international level—all new achievements for the quickly rising superpower state Japan. But they were also based in mainland Japan, and therefore at a distance from the fieldwork in Korea. ^{Footnote 15} Less biased by the imperialist center was the righteous criticism of Takenaka Yō (1903–1966), a plant science professor in higher education at the Imperial University in Seoul, whose research was more horticulturally framed. He too climbed the mountain in Jeju and found several fundamental inconsistencies (Takenaka Reference Takenaka1936). Nevertheless, his critique was ignored. A small group of Korean botanists led by Jong Taehyon (1883–1971), who had been educated as an assistant to Ishidoya, began a project to make an inventory of vernacular plant names in the late 1930s in a drive to find Korean identity in botanical geography. ^{Footnote 16} Despite all the efforts by the Japanese to insert the Tokyo Cherry in a Korean phytogeography, these Korean botanists were not convinced and gave no Korean name for Koehne’s nudiflora, whereas the Tokyo Cherry itself was called simply “Sagura” after sakura, the generic Japanese for cherries (Jong et al. Reference Jong, Pong-sup and Hwi-jae1937, 96).

The King Cherry, a hybrid for independence and national pride

Then the Pacific War broke out. Cherry blossoms became an important Japanese propaganda tool for recruiting young students to serve as kamikaze pilots (Ohnuki-Tierney Reference Ohnuki-Tierney2002). During and after the war the USA continued its cherry blossom celebrations every spring in Washington D.C. (Kuitert Reference Kuitert, Woudstra and Allen2022a). In Japan, many Tokyo Cherries were replanted immediately after the defeat (Hiratsuka Reference Hiratsuka2001, 158-159). However, for Koreans, the end of the war meant the end of Japanese colonialism, and for some the uprooting of Tokyo Cherries, that now could burn as fuelwood, often with feelings of revenge (see figure 4) (Anonymous 1945; Takekuni Reference Takekuni1999, 234-235; Hwang Reference Hwang2007, 25-26).

Figure 4. The desire to remove the cherries that had been the symbol of Japan’s colonial rule was one of the expressions of revenge among the Koreans immediately after liberation. From Byeol nara 1945, coll. Kobay Auction.

The new Republic of Korea assigned Park Mankyu (1906–1977), a middle school biology teacher employed by the Ministry of Education, the critical post-liberation task of investigating the natural resources of plant life (Hyun Reference Hyun2020). His An Index of the Plants of Our Country lists fifty-eight species and varieties of Prunus, with synonyms and sometimes a short remark. Matsumura’s yedoensis is given as “Someiyoshino” and explained as a cultivated decorative blossom cherry with a vernacular name, Wangbeonnamu, with Jeju Island as native land. In contrast, Koehne’s yedoensis var. nudiflora gets a Korean name Minbeonnamu with a simple “Jeju Island” (Park Reference Park1949, 118–121). This seems to be the first time that Wangbeonnamu, King Cherry Tree, was published officially as a vernacular name for the Tokyo Cherry. The “wang” (king) is a complementary for “big” in plant names, and referred, in this case, to the king-size flowers. But a few years later the peninsula divided and the Korean War soon broke out, with its disastrous and destructive consequences.

In Japan, a new genetic research facility was set up where, from 1949, Takenaka Yō, who had returned from Seoul, began investigating cherries. His breeding experiments with the Ōshima Cherry and Higan Cherry as parents, following Wilson’s classification, led to a wide range of plants very similar to the Tokyo Cherry, supporting the case that it was a nursery hybrid and not a wild species (Takenaka Reference Takenaka1963). One of these chance seedlings was named “Shōwa-zakura,” in reference to the imperial era of Shōwa and its Emperor Hirohito, a figure whose responsibility and role in the war are still under discussion. In April 1965 the Emperor himself visited Takenaka to see this cherry in person (Mori Reference Mori2013).

The international acclaim for the yedoensis case had thus far been limited to circles of fellow researchers. However, in the 1950s, in the milder zones of Soviet Russia, decorative cherries from the East regained interest from an unanticipated source. The botanist Aleksandr Vasil’yev (1902–1979), attached to the Sukhumi Botanical Garden in Abkhazia, had travelled to China and various European countries to explore useful plants to grow in his region (Ayba et al. Reference Ayba and Alexandrovna Gulanyan2015). Using earlier Soviet taxonomy, he classified Japanese cherries under the genus Cerasus, including this time yedoensis (Vasil’yev Reference Vasil’yev1957, 124), thus unexpectedly augmenting the scientific status of this garden plant from outside the established circles of cherry research. The Soviet Union and China soon became allies with North Korea in 1961, and the iron curtain fully descended over Northeast Asia. Japan and South Korea were thus forced to become geopolitical allies, bringing the South Koreans into a period of nation-building and a politically supported search for cultural identity (Kim Reference Kim1976, 10–12). To this end, South Korea borrowed Japanese methods of cultural mobilization to facilitate national development as part of a deliberate state policy. Korean government policies were pro-Japanese in effect, while promoting “triumph over Japan,” rather than anti-Japanese emotions in its populism (Park Reference Park2010, 71–76). The legacy of cherry symbolism in Korea found its own solution within this paradox.

In April 1962, a group of researchers sponsored by the Dong-A Ilbo newspaper, and headed by Park Mankyu—who had just become a university teacher of plant taxonomy and now was director of Korea’s National Science Museum (Hyun Reference Hyun2020) climbed Halla Mountain (Park Reference Park1965, 14). A few days later, the local newspaper could report in jubilant phrasing that a group of scientists had discovered the King Cherry Blossom Tree (Wangbeotkkot-namu) on Halla Mountain, the native place of Japan’s National Flower (Park Reference Park1962). Consequently, the King Cherry and not an internationally acclaimed scientific Latin plant entered the public discourse nationwide a few days later (Kim Reference Kim2011, 132). Park’s academic paper followed, and natural monuments to protect sites of the wild King Cherry were set up (Park Reference Park1965, 14–15).

Assured that the Tokyo Cherry was of native Korean blood, Jinhae City decided to revive the cherry image of its naval port as a strategy to promote tourism. However, because planting material was not easily available in Korea, the first two thousand clonal Tokyo Cherries were imported from Japan. With added support from Koreans living in Japan, the city had managed to plant over 300,000 cherries by 2006 (Hwang Reference Hwang2007, 26–28; Korea Institute 1998, 22–25). During these years not only in Jinhae, but all over South Korea, cherries were planted abundantly, boosted by the Great Cherry Planting Campaign announced by President Park Chunhee (Mitsuhashi Reference Mitsuhashi2016, 39–40). The idea of celebrating spring with a picnic or a walk under “native” cherry blossoms, those that had generated the colonial oppressor’s Tokyo Cherry, made the Jeju hypothesis attractive, this time not for Japanese imperialists, but now paradoxically for Korean chauvinist researchers.

Research on Jeju, however, was not easy. Among the islanders, the cherry was valued as timber, so that old trees were extremely rare (Korea Institute 1998, 11–12). Taquet had found the tree for his herbarium no. 4638 high on the slopes of the Halla Mountain. In these early years of the twentieth century, and at the altitude where he found the specimen, the forest was not undisturbed. A number of shiitake-mushroom farms were actively being cultivated (Rikuchi 1917/18) which established a secondary forest edge as a habitat for cherries in hybridization, and also made the mountainside accessible to plant explorers on foot. ^{Footnote 17} Koidzumi, Takenaka, and Park found their King Cherries at roughly the same altitude at the upper edge of pasture land in remnant patches of forest (Takenaka Reference Takenaka1936; Park Reference Park1965, 14). However, researchers who have searched Mount Halla in the 1980s and beyond have so far not been able to rediscover either the trees found by Taquet or those found by Koidzumi and Takenaka (Kim Reference Kim2011, 132).

Korean research began as an investigation into morphological details of flowers and leaves of trees on Halla Mountain. It became clear, first, that the King Cherry was rare; among the many Higan and mountain cherries only ten specimens were counted in 1965, and it also seemed to be a hybrid between these two (Harn Reference Harn1965, 11, 18). Horizontal starch gel electrophoresis in three buffers gave further strong evidence for this hybridization (Harn et al., Reference Harn, Kim, Yang and Chung1977). Yet, other electronic microscopy research on pollen found a morphology that seemed to deny such hybridization (Park et al., Reference Park, Moon Hong, Kyung Sik and Sangtae1984). Cladistical analysis of morphological characteristics again introduced a different parent species (Kim Reference Kim1990). Academics did not interfere with the public discourse, but sought answers to pressing questions about the King Cherry’s identity through natural science, mathematics, and technology, setting the mood for decades to come. In a conclusive assemblage of all possible scientific research, an official government report stressed the close relationship between the cultivated Tokyo Cherry and the King Cherry hybrids, concluding that the wild King Cherry of Jeju had evolved as a distinct, independent taxon (Kim Yun-sik Reference Kim1998, 68–69), nicely affirming the geopolitical setting of a self-confident and independent Korea in partnership with its neighbor.

On Jeju Island, from 1997, a cherry festival with various events was staged, attracting many visitors, including not a few Japanese tourists (Korea Institute 1998, 28–30). Jeju City and Jeju University gained a clear role. A research team from the university surveyed the natural habitat of the King Cherry discovering this time thirty-three specimen trees of various sizes distributed up the Halla Mountain at an altitude of between 450 and 800 meters; flowers, leaves, fruits, and seed were sampled and also showed a large variability whereas the size of these was mostly smaller than of cultivated Tokyo Cherries. A further two pubescent cherries, with morphological details slightly differing from the ones that Nakai had named before, were also classified as different forma, while two new Prunus species and a new variety for P. yedoensis were identified (Kim Chan-soo Reference Kim1998, fig.20, 89; Kim Chan-soo et al., Reference Kim1998). The minute definitions of new taxa went hand in hand with the discovery of a large variability. It was clear that research had to focus more in detail on the King Cherry itself.

With the changing political mood and its popular appeal, the King Cherry had turned into an asset for developing cultural tourism. To this end the Korea Institute of Environmental Policy and Evaluation from the Ministry of Environment stressed that genetic research was of utmost importance to find and propagate an excellent variety that should be mass-produced by tissue culture and widely distributed (Korea Institute 1998, 23, 56, 57). Research on mass propagation technology soon began (Kim et al., Reference Kim and Zin-suh2012).

It might have been expected that genetics would be a promising avenue for evaluating excellence and parentage. However, such sophisticated research technology in itself does not guarantee good science, and genetics in plant taxonomy depart from results that are already known from field morphology. ^{Footnote 18} In Japan, the Tokyo Cherry was indeed proved to be a hybrid of the Ōshima Cherry and the Higan Cherry, where the latter was the seed parent and the Ōshima Cherry the pollen donor (Kaneko et al. Reference Kaneko, Toru and Koichiro1986; Innan et al. Reference Innan, Ryohei, Naohiko and Koichiro1995; Iketani et al. Reference Iketani, Satoshi, Takayuki, Toshio, Nobuko, Yoshihiko and Toshiya2007; Kato et al. Reference Kato, Matsumoto Asako, Katsuki Toshio, Kawahara Takayuki, Tsuda Yoshiaki, Nakamura Kentaro, Shiroishi, Gojobori and Yoshimaru2014). After Wilson (Reference Wilson1916) and Takenaka (Reference Takenaka1963), this does not come as a sensational surprise. Traditional cherry nurseries had the famed selections thanks to centuries of breeding experience. Many of these cherries are not sterile and continue to produce freely germinating seeds today. Any such nursery automatically begins to function like some condensed and highly variable hybrid swarm where spectacular cherry hybrids are easily found among seedlings, including hybrids of the parents of the Tokyo Cherry. The Ōshima Cherry is grown as rootstock and the Higan Cherry has a striking weeping form, which, since the seventeenth century, has appeared in cherry lists as ito-zakura. That the Tokyo Cherry showed up in a specialized cherry nursery in feudal Somei is natural and self-evident.

And what about the King Cherry? Genetic research by a group of scientists in Korea on five King Cherries found on Jeju indicated that four—one of these legally protected—were natural hybrids from a cross between seed parent Higan Cherry and a paternal mountain cherry, all clearly different from the Tokyo Cherry; the fifth one in this research was an accession of the Tokyo Cherry escaped from culture (Baek et al. Reference Baek, Choi Kyung, Yu Hee-Ju, Jang Hoyeol, Kim Hyuk-Jin and Joo-Hwan2018, 10–11). Tokyo Cherries can be found one hundred meters from one of the natural monument sites in Jeju (Korea Institute 1998, 58); many had supposedly been planted on Jeju Island during and after the 1910s (Takenaka Reference Takenaka1936), and again in a large-scale roadside planting during the 1930s (Park Reference Park1965, 13–14). Elsewhere on the Halla Mountain the clonal Tokyo Cherry has left its genetics in natural habitats of the King Cherry (Cho et al. Reference Cho and Kim2019, 11–12). Bees can bring pollen to and from the Tokyo Cherry as far as two to three hundred meters (Mukai Reference Mukai2014, 24–25); flying birds bring seeds for kilometers. And, of course, there are also several wild cherry species in the forests of Jeju. One officially protected King Cherry was in fact a Higan Cherry (Lee Reference Lee1996), and Taquet’s herbarium number 4638 is presently interpreted as the pubescent form of the Japanese Mountain Cherry (Chang and Kim Reference Chang and Hui2019). The flowering cherries of East Asia are known for their intra-specific hybridization. An active and complex hybridization of wild cherry species, including back-crossing of hybrids with their parent species, and with the Tokyo Cherry, has resulted in a highly active hybrid swarm on Jeju Island; it is not the kind of hybridization that produces a new hybrid species (Cho et al. Reference Cho, Baek, Kim, Shin, Kim, Choi, Kang, Yu, Kim and Mun2017, 457).

However clear the conclusions may be, genetic research has not been free from bias. The wild King Cherry is considered to have “superior flower, cherry, and shape ornamental characteristics” with “a beautiful shape”, “with superior ornamental characteristics” (Baek et al. Reference Baek, Choi Kyung, Yu Hee-Ju, Jang Hoyeol, Kim Hyuk-Jin and Joo-Hwan2018, 2, 3, 11). Yet, earlier research had stated that its botanical details were generally smaller than the Tokyo Cherry (Kim Chan-soo Reference Kim1998, vii). For the researcher, the problem then becomes to “correctly identify” the King Cherry in the wild “with highly precise tools as molecular markers” (Baek et al., Reference Baek, Choi Kyung, Yu Hee-Ju, Jang Hoyeol, Kim Hyuk-Jin and Joo-Hwan2018, 11). In line with the Ministry of Environment, and the financial support of the National Research Fund of Korea, genetic research was directed towards an active hybrid swarm with the task of finding the “correct” King Cherry. But the Tokyo Cherry also must be defined as “correct”: the clone that derives from the Koishikawa Garden is the true clone, others not (Iketani et al., Reference Iketani, Satoshi, Takayuki, Toshio, Nobuko, Yoshihiko and Toshiya2007, 2–4), while propagating by seedling is considered incorrect (Katsuki et al., Reference Katsuki and Hiroyuki2016, 1415). Although genetics can bring hard data, the research papers above do not explain how that genetic data can be used to establish correct ancestry.

Two iconic cherries, concluding remarks

Sometime around the mid-nineteenth century a Somei gardener brought his spectacular Tokyo Cherries to the Kan’ei-ji Temple grounds. He could not even have dreamt about its future as National Flower or the bias and the overblown discourse it would bring to modern plant science. Why was this garden plant inflated so much?

Japan’s wild flora had entered Western scientific discourse through plant hunters such as Thunberg and Von Siebold. With the advance of society in post-feudal Japan, plantsmen and herbalists faced the European hegemony of modern scientific botany ^{Footnote 19} where they were in an underdog position while native plant material, collected by foreigners, was sent in a never-ending flow of garden material and herbaria to Western botanists: Faurie discovered well over 1300 “new” species in Japan (Koidzumi Reference Koidzumi1936, 11–12). To the frustration of Japanese botanists, Europeans quickly published spectacular numbers of light-hearted new names for plants they had never seen in the wild (Yatabe Reference Yatabe1890). But victories in the Sino-Japanese War (1895) and the Russo-Japanese War (1905) made Japan a major world power, admired by many Western nations and provided Japanese botanists with the psychology to overcome their frustration of not having been taken seriously by the West. ^{Footnote 20} Japan’s cherries were a celebrated, well distributed, local group of plants with rich horticultural practice where victory could be gained globally. In a straightforward competition with Wilson, Miyoshi published his monograph on Japanese cherries only twenty days earlier than his American rival (Miyoshi Reference Miyoshi1916; Wilson Reference Wilson1916), while Koidzumi and Koehne worked more in cooperation on theirs (Koidzumi Reference Koidzumi1913b, 254–312; Koehne Reference Koehne1917). In the heat of the battle, Miyoshi assigned dozens of new Latin forma names to deviating individuals of Japanese Mountain Cherries found at famous cherry sites, choosing new Japanese names or turning to the names given by cherry lovers in the past. ^{Footnote 21} In a similar drive to excel among Western botanists, (Lee Reference Lee2015, 676), Nakai discerned seven forms of pubescent cherries in Korea, relying on minute details (Chang et al. Reference Chang, Chang, Yoon Park and Roh2007, 36). And these botanists were not the only cherry scholars. Botany, which had been claimed by western imperialist scientists could be returned to the Japanese by Koidzumi and Nakai, becoming corresponding members of a global community and visited the West to verify herbarium collections on Japanese plants (Ohwi Reference Ohwi1932). It is this context, including defeat and victory in real war and a typical Berlin School drive for encyclopedic perfection, that made Koehne support Matsumura’s perspective on the Tokyo Cherry by proposing his nudiflora. If Koehne had been aware that this herbarium was a hybrid, he would not have taken the trouble as, for him, hybrids were inferior bastards that should not be named separately or described extensively (Koehne Reference Koehne1893, IX). It was an explicit statement of a self-evident truth in plant taxonomy. Authority and ego of the new, scientific persona, the male botanist could push such things through in a dialectic of science adjusting to increasing and cheering nationalism. ^{Footnote 22} An East Asian professor-student attitude made Nakai and Koidzumi eager to provide a wild or even an endemic species taxon to the clonal garden plant their professor had tried to classify as species. After independence Korean researchers entered the international arena in a similar underdog position and relied on research reports of the Japanese (Park Reference Park1949, 3–10). Statements were once again made quickly and without many research standards. While passing on a problematic taxon, a vernacular Korean identity for the Tokyo Cherry was incidentally constructed, while more balanced local research was ignored (Takenaka Reference Takenaka1936; Jong et al. Reference Jong, Pong-sup and Hwi-jae1937).

From the 1950s, taxonomists worldwide began adhering to the obligatory rules for publishing valid and legitimate botanical species names. The hybrid taxon Prunus × yedoensis or Cerasus × yedoensis was internationally accepted and became used for a range of cherries that were similar to the Tokyo Cherry. Besides the Tokyo Cherry, Korean and Japanese scientists have discovered and discerned today a large number of yedoensis-related taxa. ^{Footnote 23} All of these are present as few trees in the wild or as a few cloned ones from a wild tree that has disappeared, or as herbarium only. All are hybrids with the Higan Cherry as the seed parent; for the pollen parent we find the Korean Mountain Cherry, the Japanese Mountain Cherry, or the Sargent Cherry (Katsuki et al., Reference Katsuki and Hiroyuki2016, 1416–1419). These were discovered where distribution of the parent species overlaps. In such a habitat, new hybrids between the parents will continue to spring up. And as East Asian cherries are quite variable, these foreseen hybrids will have visibly varying botanical details with a different genetic profile. Should these receive a Latin taxon name then? ^{Footnote 24}

Later in the same year, after his daring statements, Koidzumi reported that Prunus sacra was in fact not the missing link between the Jeju cherries and the Tokyo Cherry. Toning down the discourse, he reported it to be a simple hybrid between the Higan Cherry and the Japanese Mountain Cherry that had been planted in the temple by a gardener who had found it nearby (Koidzumi Reference Koidzumi1932b). But Japanese researchers never quoted this paper by Koidzumi, as it could be ignored in face of the exhilarating discourse that has been examined throughout my paper. For centuries, gardeners have been selecting special cherries from among hybrids on the nursery and in the forest. There can be various reasons for selecting these cherries, but they always differ according to time, place, and cultural predilection. It seems to me that some Korean and Japanese botanists have been eager to select hybrids from the Higan Cherry in the wild, or from an old temple; nationalistic biases and present-day chauvinism made them arbitrarily select plants resembling the Tokyo Cherry, and these botanists consequently named them in respectful Latin and classified them as wild varieties or even species. Because botany, taxonomy, and genetics are considered natural sciences, questions of correctness arise. But how can natural science define the correctness of the King Cherry? And once the “correct” King Cherry is located on Mount Halla, what should be done with the perhaps not so correct Natural Monuments, the King Cherry as an endangered species, and the rest of this hybrid swarm on the mountain that confuses the beautiful landscape of the correct King Cherry? In the end is all of this research not interfering with far more urgent biodiversity research? The correct Tokyo Cherry is only relevant in historic respects and, for some, perhaps in reverence to the respected professor Matsumura, or to the Nation’s Flower. Since it is a clone we do not even need a type specimen. Should all incorrectly propagated Tokyo Cherries, the genetically different ones procured from seed, be uprooted and burned? ^{Footnote 25}

These two cherries are highly cultural and belong to the field of humanities, horticulture and landscape business, but have been pulled into the field of natural science starting with an impurity of standards around Matsumura Jinzō’s basionym in 1901.

Note: Names of Korean and Japanese persons are given family name first, followed by given names.