基于 ITS1 序列和形态学数据对半日花科（紫草科）半日花属、吊灯花属和相关类群的系统分析。

A systematic analysis of Heliotropium, Tournefortia, and allied taxa of the Heliotropiaceae (Boraginales) based on ITS1 sequences and morphological data.

机构信息

Institut für Biologie, Systematische Botanik und Pflanzengeographie, Freie Universität Berlin, Altensteinstrasse 6, D-14195 Berlin, Germany;

出版信息

Am J Bot. 2002 Feb;89(2):287-95. doi: 10.3732/ajb.89.2.287.

DOI:10.3732/ajb.89.2.287

PMID:21669738

Abstract

The relationships of Heliotropium, Tournefortia, Schleidenia, Ixorhea, and Ceballosia of the Heliotropiaceae (Boraginaceae in the traditional sense, Boraginales) are investigated using molecular data (ITS1). These genera form a monophyletic group. Five clades can be distinguished on the basis of molecular data, morphological traits, and distribution. In their current circumscription, Tournefortia is polyphyletic and Heliotropium is paraphyletic. Tournefortia section Cyphocyema is the sister group to all other ingroup taxa. Heliotropium section Orthostachys including Schleidenia sensu lato is the well supported sister group of a clade comprising the other species of Heliotropium sensu stricto (s.s.), Tournefortia section Tournefortia, and Ceballosia. Heliotropium s.s. forms two clades: one clade includes all species of the Old World and represents the only monophylum of Heliotropium s.s. The other clade consists of all Heliotropium s.s. species of the New World but also includes Tournefortia section Tournefortia and Ceballosia. The results suggest that taxonomic changes are inevitable.

摘要

使用分子数据（ITS1）研究了半日花科（传统意义上的紫草科，紫草目）中的半日花属、厚壳树属、鞘蕊花属、异黄杨属和塞巴洛斯属的关系。这些属形成一个单系群。基于分子数据、形态特征和分布，可区分出 5 个分支。在其目前的范围中，厚壳树属是多系的，半日花属是并系的。厚壳树属的 Cyphocyema 组是与所有其他内类群分类单元的姐妹群。包括鞘蕊花属广义概念（sensu lato）的半日花属Orthostachys 组是另一个包含严格意义上的半日花属（s.s.）、厚壳树属的 Tournefortia 组和塞巴洛斯属的分支的支持良好的姐妹群。严格意义上的半日花属形成两个分支：一个分支包括旧大陆的所有物种，代表半日花属的唯一单系群。另一个分支由所有新大陆的半日花属物种组成，但也包括厚壳树属的 Tournefortia 组和塞巴洛斯属。结果表明，分类学的变化是不可避免的。