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The "Wadatsumi-no-ki" (Nothapodytes amamianus) belongs to Icacinaceae (the White pear family). It is a semi-tall deciduous tree that is an endemic species found on Amami Oshima in Japan's Amami Islands. It grows in coastal areas of central and southern Amami Oshima and reaches a height of about 10 m. Currently, only about 20 trees have been confirmed, and it is classified as Critically Endangered (CR) in the Ministry of the Environment's Red List. Until recently, it was considered to be the same species as "Kusa-mizuki", which is distributed throughout the Yaeyama Islands and Taiwan; however, in 2004, a research team led by Makoto Kato of Kyoto University confirmed that it is a new species. Its Japanese name is derived from the hit song "Wadatsumi no Ki" by Chitose Hajime, a singer from Amami. It blooms white flowers about 1 cm in diameter in mid-May. Compared to "Kusa-mizuki", it is said to have larger leaves and flowers, as well as distinctive features such as protruding sacs at the tips of the stamens. Like "Kusa-mizuki", its wood and leaves contain Camptothecin, a raw material used in anticancer drugs.
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