国产三角瓣花属(茜草科)订正

三角瓣花属Prismatomeris Thw．在Hooker(1873)和K．Schumann(1891)的茜草   科分类系统中隶于巴戟族Morindeae Miq．但在 Bremekamp(1966年)的分类系统中，其分类   位置未定。本属的胚根下位，花冠裂片镊合状排列和具针晶等特征与巴戟族相同，但它的花   离生，子房2室，胚珠盾形而着生于子房隔膜上半部等特征则与巴戟族明显不同。  因此，   将本属分立作族并置于Bremekamp所定界的茜草亚科Rubioideae中似乎较合适。  本文还提   供了经挑选的本属10对特征及其分类价值的说明。辨别了两个种：(1)将分布于中国的P.   tetrandra(Roxb．)K．Schum. 修订为 “P.tetrandra  (Roxb.)  K.  Schum. subsp. multiflora   (Ridley，)Y．Z．Ruan”. (2)P.  connata Y．  Z.  Ruan 被记述作新种它的热带新亚种是  P.  connata Y．  Z．  Ruan  subsp.  hainanensis Y．  Z．  Ruan。

Notes on the Genus Prismatomeris Thw. (Rubiaceae) of China

In the classification of J. D. Hooker  (1873) and of K.  Schumann  (1891), the genus Prismatomeris Thw. is included in the tribe Morindeae of Rubiaceae.  In the mo- dern classifications, e. g.  Bremekamp (1966), however, the taxonomic position of the genus is still uncertain.  The genus agrees with the tribe Morindeae in the downward radicle, valvate aestivation of the corolla lobes and presence of raphides, but it differs significantly from the latter in the free flowers, bilocular ovary and the peltate ovule attached to the upper half of septum.  Therefore, it would be more suitable that the genus is separated from the tribe Mo- rindeae Miq., and is raised to the rank of tribe, placed in the subfamily Rubioideae based on Bremekamp’s delimitation.      In the present paper ten character pairs of the genus  and the notes on their taxonomic value are presented and two following species are recognized:       1. P. tetrandra   (Roxb.) K. Schum. is found in northern India.   Its  subspecies, which is distributed in Yunnan of China and in Thailand, was previously called P. tetran- dra (Roxb.) K. Schumann, and is now revised as      P.  tetrandra (Roxb.) K. Schum. subsp. multiflora  (Ridley) Y. Z. Ruan.       2. P. connata  Y.Z. Ruan is described as a new species, that has been treated as P. tetrandra (Roxb.) K. Schum. by previous auth rs. It is native to the subtropic region of South China.  Its tropical new subspecies,  P.  connata.  Y. Z. Ruan subsp.  hainanensis Y. Z. Ruan, is found on Hainan Island.