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Japan has significant diversity in flora. Of approximately 5,600 total vascular plant species, almost 40% are endemic. [1] This richness is due to the significant variation in latitude and altitude across the country, a diversity of climatic conditions due to monsoons, and multiple geohistorical incidences of connections with the mainland.
Many plants have been introduced to Japan from mainland Asia including important crops like rice and garden plants such as the chrysanthemum. Since the Meiji Restoration, increasing numbers of plants have come from Europe, North America and elsewhere. Native food plants include the water dropwort (Oenanthe javanica) and wasabi (Wasabia japonica).
Various plants and large animals, such as the elephant Palaeoloxodon naumanni, migrated into the Japanese archipelago. [ 76 ] The Sea of Japan was a landlocked sea when the land bridge of East Asia existed circa 18,000 BCE.
Japan is within the larger region of East Asia. For the purposes of this category, "Japan" is defined in accordance with the World Geographical Scheme for Recording Plant Distributions . That is, the geographic region is defined as including the following areas, typically defined by the political boundaries of its constituents:
Coastal and swamp plant communities include plants characteristic of the tropical Pacific, including Ipomoea pes-caprae, Spinifex littoreus, Thespesia populnea, Terminalia catappa, and Macaranga tanarius. Mangrove species include Bruguiera gymnorhiza, Heritiera littoralis, Rhizophora stylosa, Avicennia marina, Sonneratia alba, and Nypa fruticans.
The Hokkaidō deciduous forests ecoregion (WWF ID: PA0423) covers the northern and southern coasts of the island of Hokkaido, the northernmost of the main islands of Japan. The region sits in the transition zone between the colder subarctic forests to the north and the more temperate forests to the south.
Japan lies at the convergence of three terrestrial realms, the Palearctic, Indomalaya, and Oceania, and its flora and fauna combine elements from all three.The ecoregions that cover the main islands of Japan, Honshū, Hokkaidō, Kyūshū, and Shikoku, along with the nearby islands, are considered part of the Palearctic realm.
The ecoregion covers an area of 138,300 square kilometers (53,400 sq mi) on the Pacific (Taiheiyo) side of the islands of Honshu, Shikoku, and Kyushu.It also includes Tsushima Island in the Korea Strait between Kyushu and Korea and the volcanic Izu Islands off Honshu's southern coast.