Abstract

Begonia hosensis, a new species of sect. Reichenheimia from Sarawak, Malaysia is here described and illustrated. Begonia hosensis resembles B. andersonii, differing in the stipule prominently keeled and female flower 5- (vs. 4-) tepaled. Ecologically, the two species are also separable: B. hosensis occurs on granitic cliffs ca. 400 km east of Kuching, the only known locality of B. andersonii, a limestone species.

中文摘要

本文報導馬來西亞婆羅洲沙勞越中部地區, 赫斯山山脈花崗岩壁上發現之一種秋海棠科新種：赫斯山秋海棠(Begonia hosensis)。赫斯山秋海棠略似另一亦產於沙勞越的安德森秋海棠(B. andersonii)，但前者托葉卵狀三角形，背面中肋處具有延伸的肉質芒尖，且葉柄近於無毛，雌花之花被片為五枚；另外，相對於僅產於沙勞越西部石灰岩地區的安德森秋海棠，赫斯山秋海棠的生育地之地質特性明顯不同。

Keyword: Begoniaceae, Begonia hosensis, Borneo, Malaysia, new species, Sarawak, sect. Reichenheimia.