【精选】现存被子植物原始类群及其植物地理学研究.pdfVIP

植 物 分 类 学 报 40 ( 3) : 242~ 259 ( 2002) Act a Phytotaxonomica Sinica 汤彦 承 路 安 民 陈之 端 张 原 张 富 民 ( 中国科学院植物研究所系统与进化植物学开放研究实 室 北京 100093) On extant primitive angiosperms and their phytogeography * TANG Yan_Ch eng LU An_Ming CHEN Zhi_Duan ZHANG Yuan ZHANG Fu_Min ( Labor atory of Systematic and Evolutionary Botany , Institute of Botany , the Chinese Academy of Sci ences , Bei ing 100093) Abstract On the basis of invest igat ing and evaluat ing the circumscriptions of primitive angiosperms by different authors, in th e present paper we proposed a new conception with 60 primitive families of angiosperms following our eight_class system of flowering plants. A phytogeograph ical study was car2 ried out using these families as characters, and Thakhta an. s floristic / regions0 of the world as OTUs. As a contrast, we simu ltaneously conducted another data set including only 32 basal families according to molecular systematic studies during the recent years. The results by UPGMA analyses indicated that Eastern Asiatic Region is really very unique; it is closely related to North American Atlantic Region and Madrean Region of eastern and western North America, but has more character2 ist ics similar to Indochinese Region. Additionally, the UPGMA trees showed that 4 circum_Pacific districts, e.Asia, e. w. of N . America, partly tropical Asia, e. Australia, sw. Pacific is2 lands, tropical C. S. America, are the areas of great concentration of primitive angiospermous families. This distribution pattern obviously relates to the birthplace and dispersal routes of angio2 sperms and the history of the Pacific Ocean. Key words Primit ive angiosperms; Basal angiosperms; Phyto