直立百部的一个新异名

根据对直立百部Stemona sessilifolia（Miq．）Miq．大量标本的研究和野外调查及引种栽培观察，结合对山东百部Stemona shandongensis D．K．Zang模式标本产地的调查，发现直立百部的形态性状是多变的。研究表明它的习性受生境影响而多变，从直立半灌木到蔓生都有；叶型多变；花通常出自叶腋，而花梗有时与叶柄，甚至主脉合生；内轮花被片大多明显大于外轮。山东百部的形态性状处于直立百部的变异范围内，因此作为独立的种是难以成立的，应处理为直立百部的新异名。

A new synonym of Stemona sessilifolia (Stemonaceae)

Based on herbarium and field observations and transplant experiment,Stemona sessilifolia (Miq.) Miq. was found to be a highly variable species in morphological characters such as habit,leaf shape,and the relative size of inner two perianth segments and the outer two perianth segments. In particular,the habit depends on whether the plant is growing in an open habitat,when it remains erect,or under forests when it is at first erect but then adopts a scandent habit. Thus it is clear that S. sessilifolia is a variable species and that S. shandongensis D. K. Zang must be treated as conspecific with it.