Acer calcaratum is an Asian species of maple found in Yunnan and northern Indochina (Myanmar, Thailand, Vietnam). It is very rare in China.Flora of China, Acer calcaratum Gagnepain, 1948. 三裂枫 san lie feng
Acer calcaratum is a small tree up to 7 meters tall. Leaves are non-compound, the blade up to 15 cm long and 21 cm wide, with 3 deeply cut lobes but no teeth.Gagnepain, François 1948. Notulae Systematicae. Herbier du Museum de Paris 13: 192-193 description in Latin, commentary in FrenchGamble, James Sykes 1908. Bulletin of Miscellaneous Information Kew 1908: 446 description in Latin, commentary in English, as Acer osmastonii
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