Abstract
Perrottetiataronensis from the Dulong Jiang valley in northwestern Yunnan Province, China and the Babulongtan mountain range in northern Kachin State, Myanmar is here described as a new species of the Dipentodontaceae. It is the third species of the genus to be recognized for China and the first to be reported for Myanmar. It is similar to P.alpestriss.s. but differs by characters of its leaf margins, inflorescences, and fruit. The three subspecies of P.alpestris recognized by Hou in “Flora Malesiana” are here recognized as three distinct species, i.e., P.alpestris, P.moluccana, and P.philippinensis on the basis of differences in diagnostic characters and distribution. The report in the “Flora of China” of the Taiwan species P.arisanensis from Yunnan is determined to be incorrect due to misidentification of two specimens at KUN.
Highlights
Perrottetia Kunth is a genus of about twenty species occurring mainly in tropical America and tropical Asia
On the basis of the single Myanmar collection being a male plant and all six Chinese collections made so far being female plants in fruit, it is likely that P. taronensis is dioecious
Perrottetia taronensis is most similar morphologically to P. alpestris s.s. which occurs in Peninsular Malaysia as well as in Indonesia on Sumatra and Java plus nearby small islands
Summary
A third species has been found in China and Myanmar and is reported here in China from northwestern Yunnan Province in the Dulong Jiang valley of Gongshan Xian and in Myanmar from Kachin State in Putao District. S.s. but differs by several characters given below in the discussion and the key to the Asian and Australasian species of Perrottetia.
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