中国伞形科当归属及相关类群毛状体和果实结构的系统学价值

深入研究了当归属及其相关7属,古当归属,高山芹属,柳叶芹属,独活属,欧当归属,山芹属及前胡属毛状体和果实结构。结果显示毛状体及果实结构(如:毛状体细胞,翅,油管,维管束,中果皮,内果皮,结合面及结晶)可以用于区分当归属及其相关类群。滇南当归及隆萼当归应从当归属移入独活属,其余当归属物种分为结合面宽及结合面窄两组,前者与前胡属较为相似,但与独活属差别较大,后者与古当归属,高山芹属,柳叶芹属,欧当归属有相似之处。支持分子系统学揭示的当归属不是个自然类群,当归属与前胡属共同位于当归分支,而独活属位于独活分支。山芹属果实结构与其他属不同,翅的中果皮无细胞,且伴生油管位于维管束内侧,为分子系统学显示此属与高山芹属,柳叶芹属,及欧当归属亲缘关系较远提供了形态学依据。

Trichomes and fruit structures of Angelica and related genera of the family Apiaceae and their taxonomic significance

Trichomes and fruit structures of Angelica and seven related genera (Archangelica, Coelopleurum, Czernaevia, Heracleum, Levisticum, Ostericum, and Peucedanum) were studied. Differences in the trichome and fruit structures (e.g. wing, vitta, vascular bundle, mesocarp, endocarp, commissural side, and crystals) were found to provide useful characters to distinguish between Angelica and related taxa. Angelica austro-yunnanensis and A. oncosepala should be moved to the genus Heracleum, and other taxa of the Angelica group could be divided two groups, one with a wide and the other narrow commisure. In the former the fruit structures of the taxa are similar to those of Peucedanum, and differ from those of Heracleum and in the latter they are similar to those of Archangelica, Coelopleurum, Czernaevia, Levisticum, and Ostericum. This study supports the findings from molecular research that as currently defined the Angelicaceae is not a natural group. Angelica and Peucedanum should be placed in an Angelica clade and Heracleum in a Heracleum clade. The fruit structures of Ostericum differ from the other genera in the wing without mesocarp cells, and the rib duct presenting inside of the vascular bundles. On this evidence, the genus Ostericum is not very close to the genera Coelopleurum, Czernaevia, and Levisticum.