铁线莲属铁线莲组修订(英文)

A revision of Clematis sect. Viticella(Ranunculaceae)

关键词:  铁线莲属, 铁线莲组, 分类学修订

Key words:  Clematis, sect. Viticella, taxonomic revision

摘要:

(1)对毛莨科铁线莲属(Clematis)的铁线莲组(sect. Viticella)进行了分类学修订,确定此组包含13种,1亚种和2变种(包括2新种和1新变种等级),写出此组的分类学简史和地理分布; 将此组划分为3亚组,4系,写出区分组下各级分类群的检索表,以及各种植物的形态描述,地理分布,生长环境等,并附有多幅插图。(2)特产我国东部的单型毛萼铁线莲亚组(subsect. Hancockianae)(花具4枚平展,不展宽的萼片,雄蕊无毛)被认为此组的原始群。铁线莲亚组(subsect. Floridae)(花具5～8枚平展,强烈展宽的萼片,雄蕊无毛,花粉具散孔)和湖州铁线莲亚组(subsect. Viticellae)(花具4枚渐升,多少展宽的萼片,雄蕊花丝常被缘毛,花粉具3沟)可能均由毛萼铁线莲亚组衍生而出。(3)在我国东部集中分布此组的3亚组,3系的8种,1亚种和1变种,这里是此组的分布中心,也可能是此组的起源中心。

Abstract:

(1)Clematis sect. Viticella is revised in this paper. Thirteen species,one subspecies,and two varieties,inclucling two new species, Clematis inciso-denticulata W. T. Wang and C. xiangguiensis W. T. Wang, and one new rank, C. cadmia Buch.-Ham. ex Hook. f. & Thoms. var. leptomera(Hance)W. T. Wang,are recognized. They are keyed, described, and illustrated, and classified into three subsections and four series. Brief taxonomic history and geographical distribution of the section are given.(2)The relationships among the infrasectional groups are briefly discussed. Subsect. Hancocokianae with 4-sepalled flowers, undilated spreading sepals, and glabrous stamens is considered the extant primitive group of sect. Viticella. Subsect. Floridae, characterized by having 5-8-sepalled flowers, spreading and strongly dilated sepals, glabrous stamens, and pantoporate pollen, and subsect. Viticellae, characterized by having 4-sepalled flowers, usually ascending more or less dilated sepals, usually ciliate stamen filaments, and tricolpate pollen, might all be derived from subsect. Hancockianae.(3)East China, where are concentrated eight species, one subspecies, and one variety, belonging to three subsections and three series, is the distribution centre of the section, and is surmized to be the centre of origin of it, too.