东亚千里光族款冬亚族的花部微观性状及其系统与分类学意义

FLORAL MICROCHARACTERS OF THE SUBTRIBE TUSSILAGININAE(ASTERACEAE:SENECIONEAE) OF THE EASTERN ASIA AND THEIR SYSTEMATIC AND TAXONOMIC SIGNIFICANCE

所研究的东亚款冬亚族及其相关类群的花部微观性状主要包括 :花药顶端不育组织、花药药室内壁、花药基部、花药领、花柱分枝顶端、花柱毛被、花柱分枝内表面构型和果柄细胞列数等。此外 ,根据所获证据 ,讨论了款冬亚族花部微观性状的演化趋势。花部微观性状研究表明 :毛冠菊属似乎应作为紫菀族中的一个孤立属 ;狗舌草亚族与千里光亚族和款冬亚族相比 ,似乎是一过渡类群 ;东亚款冬亚族 1 3个属似可划分为 6个自然属群。

The floral microcharacters in Subtrib. Tussilagininae are investigated in the paper. They include anther apex sterile tissue, endothecium type, anther base, anther collar, style apex, style hair, stigmatic configuration and carpodial cell rows. Furthermore, the evolutionary trends of the floral microcharacters in Subtribe Tussilagininae are discussed based on the obtainable data. The results indicate: Nannoglottis seems to be an isolated genus of the Astereae; Subtrib. Tephroseridinae is an intermediate group between Subtrib. Tussilagininae and Subtrib. Senecioninae; and based on the floral microcharacters, 13 genera of Subtrib. Tussilagininae of the eastern Asia can be aggregated into 6 genetic groups.