铁线莲属对枝铁线莲组修订(英文)

A revision of Clematis sect. Brachiatae (Ranunculaceae)

对毛茛科铁线莲属ClematisL .的对枝铁线莲组sect.Brachiatae进行了全面修订 ,确定此组共含 2 4种和 4变种 (包括 2新种 ) ,写出了此组的分类学简史和地理分布 ,对其在铁线莲属中的系统位置和起源以及组下分类进行了讨论 ;还写出了组下分类群检索表 ,以及每系和每种植物的形态描述、地理分布、生长环境等 ,并附有多幅插图。本组各种的花构造相当一致 :萼片 4,镊合状排列 ,水平开展 ,白色 ,通常呈长圆形、卵形或披针形 ,只在 2进化种呈宽椭圆形 ,外面边缘上密被短绒毛 ;雄蕊花丝狭条形 ,被柔毛 ,花药通常长圆形或狭长圆形 ,无毛 ,药隔顶端通常不突出 ;心皮密被柔毛。上述花构造与威灵仙组欧洲铁线莲亚组sect.Clematissubsect.Clematis的花构造极为相似 ,与后者的区别仅在于本组被毛的雄蕊花丝。本组是在 1 992年由黄花铁线莲组sect.Meclatis (萼片 4,通常向斜上方开展 ,黄色 ,卵形、长圆形或披针形 ;花丝由于下部变宽而呈狭披针形 ,被柔毛 )中分出建立的 ,可能与黄花铁线莲组有亲缘关系 ,并可能同自威灵仙组欧洲铁线莲亚组演化而出。本组的叶变异较大 ,自单叶至三出复叶、1 - 3回羽状复叶 ,最后到 3- 4回羽状细裂 ,表现出一明显演化趋势。根据叶的上述特征 ,以及萼片形状 ,本组被划分为 2系。第 1系 ,对?

Clematis sect. Brachiatae is revised in this paper. Twenty-four species and four varieties are recognized. They are keyed, described, and illustrated in most cases, and classified into two series. Brief taxonomic history and geographical distribution of the section are given, and its systematic position and origin are discussed. A western Himalayan species, C. graveolens Lindl., which has long been misplaced in the C. ortentalis group (sect. Meclatis), is transferred to sect. Brachiatae on the basis of its floral structure being identical with that of C. brachiata Thunb. and its allies. Two new combinations, sect. Brachiatae Snoeijer ser. Wightianae (W. T. Wang) W. T. Wang and ser. Dissectae (W. T. Wang) W. T. Wang, are made, and two species, C. zaireensis W. T. Wang and C. bowkeri Burtt Davy, are described as new.