原柳属次级区分的探讨

原柳属Pleiarina Rafin.隶属于杨柳科柳亚科Salicaceae subfam.Salicoideae;在柳亚科的系统发育中,它体现了一条单独的演化路线、代表了一个明确的谱系分枝;它自然分布于大约从南纬52度至北纬70度的非洲、南美洲、欧洲、亚洲、北美洲的广大地区,广泛生长在热带、南温带、北温带、北寒带(南缘)的各个地带。原柳属约有56个天然种,本文中被区分为2个亚属、6个组、3个系;原柳亚属Subgen.Pleiarina包含4个组,即四籽柳组Sect.Tet-raspermae,原柳组Sect.Pleiarina(包含原柳系Ser.Pleiarina,腺柳系Ser.Glandulosae,锐叶柳系Ser.Acmophyllae),马达柳组Sect.Madagascarienses和锦江柳组Sect.Fangianae;五蕊柳亚属Subgen.Lygus包含2个组,即五蕊柳组Sect.Lygus和三蕊柳组Sect.Amygdalinae。编写了亚属、组、系的检索表。提供了原柳属植物种类一览,包括它们的正名、异名、文献引注、地理分布等。

On the Subdivision of the Genus Pleiarina Rafin. (Salicaceae)

The genus Pleiarina Rafin. belongs to Salicaceae subfam. Salicoideae and is considered to em- body an independent evolutionary line et to represent a clear clade in the phylogeny of the subfamily; it distributes naturally in Africa, South America, Europe, Asia, North America from about 52 degrees south latitude to 70 degrees north latitude and exists widely in the torrid zone, the south temperate zone, the north temperate zone et the north frigid zone （southern fringe）. In the present paper, Pleiarina, consisting of about 56 natural species, is classified into two subgenera, six sections and three series; Subgen. Pleiariha comprises 4 sections,i, e. Sect. Tetraspermae,Sect. Pleiarina （incl. Ser. Pleiarina,Ser. Glandulosac and Set. Acmophyllae）, Sect. Madagascarienses and Sect. Fangianae; Subgen. Lygus contains 2 sections,i, e. Sect. Lygus and Sect. Amygdalinae. A key to the subgenera and sections and series of Pleiarina is prepared. Besides, a conspectus of all the Pleiarina species is provided,including their correct names, synonyms, bibliographic references, geographic distributions etc.