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Begonia Chongzuoensis (Sect. Coelocentrum, Begoniaceae), a New Calciphile from Guangxi, China

中國秋海棠屬側膜組(秋海棠科)新種:崇左秋海棠

摘要


本文報導中國廣西壯族自治區石灰岩地區的秋海棠屬側膜組(Begonia sect. Coelocentrum)一新種:崇左秋海棠(B. chongzuoensis Yan Liu, S. M. Ku & C.-I Peng)。本研究除提供線繪圖與彩色照片以資辨識外,並報導其染色體數(2n = 30)。崇左秋海棠與產於雲南省麻栗坡縣的斜葉秋海棠(B.obliquifolia)略似,但前者葉片之上表面具中度至稀疏的短刺毛、花序各部與果實皆光滑無毛,以及果實背翅為新月形(上緣為圓形)可資區別。目前僅知其族群分布於廣西西南部的一個陡峭的石灰岩山,為稀有植物。

並列摘要


Begonia chongzuoensis Yan Liu, S. M. Ku & C.-I Peng (sect. Coelocentrum), a new species from Guangxi Zhuangzu Autonomous Region, China, is here described and illustrated. A somatic chromosome number of 2n = 30 was determined. Begonia chongzuoensis somewhat resembles B. obliquifolia S. H. Huang & Y. M. Shui, from which it differs by the moderately to sparsely setulose leaf surface; glabrous inflorescences, flowers and fruits; and crescent-shaped abaxial wing of the fruit. The new species is known only from a limestone hill in western Guangxi.

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