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Impatiens pterocaulis sp. nov. (Balsaminaceae) from Guangxi, China


S.-X. Yu, State Key Laboratory of Systematic and Evolutionary Botany, Inst. of Botany, Chinese Academy of Sciences, CN-100093 Beijing, PR China. E-mail:


Impatiens pterocaulis S. X. Yu et L. R. Zhang, a new species of the Balsaminaceae from Yancha, Longlin, Guangxi Region, is described and illustrated. This species is similar to I. wilsonii in having nearly white flowers, 4 lateral sepals and a racememos inflorescence, but differs by having winged stems, very short-spurred lower sepal, yellowish flowers and an acuminate dorsal petal apex. Pollen characters and leaf epidermal micro-characters of these two species were studied, and the results support that the two species should be kept separate.