Generic distribution and diversity:
About 300 species, mainly in the tropics and subtropics of NE India, Burma, China, Korea, Japan, Formosa, Hainan, Indo-china, Thailand and Malesia (except for the E Java and Lesser Sunda Islands). One species occurs in the SW parts of the Unites States. In Malesia, the genus is represented by c. 110 species. (From: Soepadmo 1972.)
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