囊状嵩草(莎草科)及相关类群的分类

Classification of Kobresia fragilis C. B. Clarke (Cyperaceae) and related taxa

根据外部形态学和小坚果表皮的微形态学资料 ,研究了囊状嵩草及其相关类群的分类。在这一群植物中 ,有 1 3个相关的学名。根据以前学者用于区别这些植物的形态性状 ,无法清楚地将它们划分开。因此作者深入地研究了有关植物的 89号 2 0 0多份标本 ,重新评价了形态性状的分类学意义。为了更深入地理解这类植物的分类 ,应用扫描电子显微镜对其小坚果表皮的微形态进行了研究。根据研究的结果 ,确认了囊状嵩草Kobresiafragilis和弧形嵩草K .curvata ,其他名称做为囊状嵩草的异名 ,K .clarkeana、K .clarkeanavar.megalantha和K .curticepsvar.gyirongensis被处理为囊状嵩草的新异名。弧形嵩草从形态学和微形态学两个方面都明显不同于囊状嵩草。研究中还发现囊状嵩草的一号标本采自甘肃的碌曲 。

The classification of Kobresia fragilis C. B. Clarke and related taxa were studied based on gross morphology and nutlet epidermal micromorphology. About 13 names have been involved in the species group. They could not be clearly defined using the morphological characters employed by previous authors. Thus, more than 200 sheets of 89 specimens of related taxa were studied thoroughly, and the taxonomic significance of morphological characters was re_evaluated. In order to further understand the classification of K. fragilis and its allies, micromorphology of nutlet epidermis of these taxa was observed under scanning electron microscope. Based on the results, K. curvata C. B. Clarke and K. fragilis were recognized. Other names were treated as synonymies of K. fragilis . K. clarkeana (Kükenthal) Kükenthal, K. clarkeana var. megalantha Kükenthal and K. curticeps (C. B. Clarke) Kükenthal var. gyirongensis Y. C. Yang were reduced to new synonymies of K. fragilis . K. curvata was distinct from K. fragilis on both morphological and micromorphological basis. One specimen of K. fragilis collected from Luqu, Gansu, China, represents a new distribution record of this species in Gansu.