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Aster Shennongjiaensis (Asteraceae), a New Species from Central China

中國中部菊科新種植物:神農架紫菀

摘要


本文報導了菊科-新種:神農架紫菀(Aster shennongjiaensis W.P Li et Z.g. Zhang)。該種屬紫菀屬(Aster L.)正菀組(sect. Orthomeris A. Gray)三脈葉系(ser.Ageratoides)文中對神農架紫菀的形態學特徵和核型特徵進行了描述,並配以墨線圖和顯微照片。目前該種只在神農架海拔450-500m處發現有一個種群,而且個體數不超過300株,因而屬於瀕危種。從形態上看與神農架紫菀最相似的種是絨山白菊(Aster lasiocladus Hayata),但二者在許多特徵上顯著不同。本文比較了二種的形態特徵。神農架紫菀是二倍體,核型公式為2n=2x=18=16m+2sm。

關鍵字

菊科 神農架紫菀 中國 二倍體 瀕危種 核型 新種

並列摘要


A new species of Aster (Asteraceae) from China, Aster shennongjiaensis W. P. Li et Z. G. Zhang, is described and its morphology and karyotype illustrated. Aster shennongjiaensis is apparently endangered, presently known only from one small population in bamboo forests of Shennongjia Reserve in central China. On a morphological basis, the closest species to A. shennongjiaensis is A. lasiocladus Hayata, but they are quite different in many features. The morphological characteristics of the two species are compared. Karyotype of the new species is described and formulated as 2n = 2x = 18 = 16m + 2sm.

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