绢毛蔷薇复合体的分类学研究:峨眉蔷薇与绢毛蔷薇同种吗?

A systematic study of Rosa sericea(Rosaceae) complex:Are R.omeiensis and R.sericea conspecific?

绢毛蔷薇复合体包括绢毛蔷薇Rosasericea、峨眉蔷薇R.omeiensis和毛叶蔷薇R.mairei三种。它们的形态特征相近,特别是峨眉蔷薇和绢毛蔷薇之间界限有时不明显,以致峨眉蔷薇的分类学地位长期以来争论不休。本研究对我国主要的标本馆所藏的峨眉蔷薇、绢毛蔷薇和毛叶蔷薇2000多份标本进行了形态对比研究。我们也对横断山区的峨眉蔷薇、绢毛蔷薇和毛叶蔷薇进行了野外观察,同时,我们还应用扫描电镜(SEM)对三者花粉及种皮表面结构进行研究。对小叶、花粉及种子的形态定量分析表明,毛叶蔷薇与其余两者的区别较为明显,但绢毛蔷薇和峨眉蔷薇无论在植株或是花粉形态,还是种皮表面特征方面都存在明显的连续性,但两者在大多数情况下又有一定的区别。两者的地理分布也有所不同。综合各种性状,我们将峨眉蔷薇处理为绢毛蔷薇的变种。同时,将与这两个分类群相关的6个变型作为异名处理。处理为绢毛蔷薇的4个异名分别是腺叶峨眉蔷薇R.omeiensis f.glandulosaT.T.Yu&T.C.Ku,宽刺峨眉蔷薇R.omeiensis f.pteracantha Rehder & E.H.Wilson、光叶绢毛蔷薇R.sericea f.glabrescens Franchet和宽刺绢毛蔷薇R.sericea f.pteracantha Franchet。处理为峨眉蔷薇的2个异名分别是少对峨眉蔷薇R.omeiensis f.paucijuga T.T.Yu & T.C.Ku和腺叶绢毛蔷薇R.sericea f.glandulosa T.T.Yu & T.C.Ku。本文也给出了3个分类群详细的形态特征描述及地理分布。

The Rosa sericea complex contains R. omeiensis, R. sericea and R. mairei. They are morphologically similar to one another and the systematic status ofR. omeiensis has been controversial. In this study we examined ca. 2000 herbarium specimens of the three taxa in major herbaria in China and conducted field observations in Sichuan and Yunnan. We also performed SEM study of pollen morphology and seed coat structure. We further carried out intensive morphometric study on the leaflet, pollen, and seed morphology. Our results showed that R. mairei can safely be distinguished from other two, while there are no obvious discontinuities in pollen morphology, seed coat structure and plant morphology in general for R. omeiensis and R. sericea. Nevertheless, in most cases R. omeiensis and R. sericea can be distinguished from each other to some extent. They also have different geographical distributions. Therefore we here sink R. omeiensis to be a variety of R. sericea. Six forms related with these two taxa are synonymized. The four synonyms of R. sericea var. sericea include R. omeiensis f. glandulosa T. T. Yu ＆ T. C. Ku, R. omeiensis f. pteracantha Rehder ＆ E. H. Wilson, R. sericea f. glabrescens Franchet, and R. sericea f. pteracantha Franchet, while two synonyms of R. sericea var. omeiensis include R. omeiensis f. pauco＇uga T. T. Yu ＆ T. C. Ku and R. sericea f. glandulosa T. T. Yu ＆ T. C. Ku. Detailed morphological descriptions and geographical distributions of the three taxa are given.