铁线莲属菝葜叶铁线莲组修订(英文)

A revision of Clematis sect. Naraveliopsis(Ranunculaceae)

对毛茛科Ranunculaceae铁线莲属Clematis的菝葜叶铁线莲组sect.Naraveliopsis进行了全面修订,确定此组共含21种1亚种和1变种;写出此组的分类学简史和地理分布,并讨论了此组在铁线莲属中的系统位置;将此组划分为3亚组,写出分亚组、分种检索表,以及各种植物的形态描述、地理分布、生长环境等,并附有多数种的墨线图。根据对此组植物形态特征的分析,观察到以下重要演化趋势:(1)叶从单叶演变到二回羽状复叶或二回三出复叶;(2)花从两性到单性,从无退化雄蕊到有退化雄蕊;(3)雄蕊从无毛到有毛;(4)药隔突起从短(0.5–0.7mm)到长(8.5–10mm)。根据上述演化趋势,花两性、雄蕊被毛、退化雄蕊存在的荔波铁线莲亚组subsect.Liboenses(1种,特产贵州荔波)和花由两性变为单性的亚组subsect.Macgregorianae(2种,特产菲律宾)被认为是菝葜叶铁线莲组的进化群。在原始的菝葜叶铁线莲亚组subsect.Smilacifoliae(花两性,雄蕊无毛;18种,广布亚洲热带地区)中,具单叶,花无退化雄蕊,药隔突起较短的菝葜叶铁线莲C.smilacifolia和滇南铁线莲C.fulvicoma被认为是较原始的种,而具三出复叶和退化雄蕊的C.vietnamensis和丝铁线莲C.loureiriana,以及具羽状复叶和长药隔突起(长达10mm)的C.papillosa等3种则被认为是此亚组的进化种。自中南半岛北部山地向西经云贵高原南部至喜马拉雅东部山区集中分布有菝葜叶铁线莲组的13种植物,这一山区地带被认为是此组的分布中心。在此山区地带中,菝葜叶铁线莲的分布区和滇南铁线莲的分布区重叠部分的山区可能是此组的起源中心。

Clematis sect. Naraveliopsis is revised in this paper. Twenty-one species with one subspecies and one variety of sect. Naraveliopsis, which are widespread in tropical Asia, are recognized. Of them, one species, C. vietnamensis W. T. Wang ＆ N. T. Do, is described as new from Vietnam. They are keyed, described, and illustrated in most cases, and classified into three subsections. Brief taxonomic history and geographical distribution of the section are given, and its systematic position and origin are discussed. The classification proposed by Wang （2000） is revised with reduction of the subsect. Liboenses ser. Loureirianae. According to the evolutionary trends observed, subsect. Liboenses, characterized by having bisexual flowers and hairy stamens, and subsect. Macgregorianae, characterized by having unisexual flowers, are regarded as advanced groups. In the primitive subsect. Smilacifoliae, characterized by having bisexual flowers and glabrous stamens, C. srnilacifolia and C. fulvicoma, which have simple leaves, no staminodes, and short connective projections, are considered as the primitive species. C. viefnamensis and C. loureiriana, which have ternate leaves and staminodes, and C. papillosa, which have pinnate leaves and long connective projections, are recognized as the advanced species of that subsection. The montane regions of northern Indochina Peninsula plus southern Yunnan-G＇uizhou Plateau and the eastern Himalaya, where 13 species of sect. Naraveliopsis are concentrated, is regarded as the distribution centre. The part within the montane regions mentioned above, where the distribution areas of C. srnilacifolia and C. fulvicoma overlap, may be the centre of origin of sect. Naraveliopsis.