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作 者 ：邓敏 周浙昆

期 刊 ：云南植物研究 2004年 26卷 01期 页码：1-3

关键词：种子植物多样性；高山流石滩；滇西北；

Keywords:Seed plants,

摘 要 ：通过多次对滇西北高山流石滩野外实地考察、标本鉴定并查阅有关文献，建立数据库统计得到流石滩种子植物共计29科、103属、519种。其中中国特有植物295种，占总数的56.8%，滇西北特有植物54种，占10.4%。有10种属的分布区类型(包括7个变型)，北温带分布类型最多，占总属数的47.5%。在整个高山流石滩中，草本有455种，占总数的87.7%，其中多年生草本421种。流石滩植物中具有多种生态、生理适应方式，低矮平卧状植株、莲座状、垫状、极矮小草本、密集丛生是植物的重要适应方式。根茎及发达的肉质根或木质根是典型流石滩上的主要适应方式，分别占植物总数的19.7%，31.0%。果实中干果共计518种，其中蒴果298种。由于流石滩处于生态脆弱区，人为干扰易对生态系统造成危害。本文对流石滩种子植物多样性组成分析，为合理保护和利用流石滩植物资源提供基础资料。

Abstract:In the last 2 decades of 20th century,a great number of cladistic studies of seed plants using morphological characters have been carried out.The results show that extinct Pentoxylon plus extinct Bennettiales and extant Gnetales is the sister group of angiosperms,and they form a robust clade termed anthophyte clade.The anthophyte hypothesis has played a significant role on the investigation of the origin of angiosperms.It stimulates the discussion on the time of the origin of angiosperms which dated back as early as the Triassic or even the Carboniferous.The hypothesis proposes the NeoEnglerian theory except supporting previous Euanthial theory for the origin of angiosperms. However many recent outcomes of molecular phylogenetic studies of extant seed plants are:(1)refutation of anthophyte concept;(2)Gnetales not as the sister group of angiosperms but as the sister group of conifers or even nested within in conifers and then the sister group to Pinaceae.These results are certainly not surprising,because the phylogeny cannot be discerned with extant taxa alone for such seed plants consisting of many extinct taxa.The anthophyte may be a valid clade but its name is inappropriate.In substitution of the name of AGPB clade (acronym of Angiospermae,Gnetales,Pentoxylon and Bennettiales) for anthophyte clade may be reasonable.

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