Abstract: The genus Physospermopsis (Umbelliferae) included about 11 species. Among them P. hirsutula (C. B. Clarke) Farille, P. lalabhduriana Farille et Malla, P. bhutanensis Farille et Malta, and P. muktinathensis Farille et Malla are endemic in the Himalayas and with two spe-cies i.e. P. obtusiuscula (Wall. ex DC.) Norman, P. rubrinervis (Franchet) Norman widely dis-tributed in both of the Himalayas and the Hengduan mountains of China. There are five spe-cies endemic in SW China, of which four species endemic in the Hengduan Mountains i.e. P. alepidioides (H. Wolff et Hand.-Mazz.) Shan, P. muliensis Shan et S. L. Liou, P. cuneata H. Wolff, P.forrestii (Diels) Norman and another species P. delavayi (Franchet) H. Wolff from the Hengduan Mountains extends to NE and C. Yunnan of China. This region belong to the Sino-Himalayan area. They grow at high altitudes from 2250m to 4800m and concetrate at al-titudes from 2800m to 4000m. Pollen grains of five species were examined by LM and SEM. Pollen morphology of P. alepidiolides and P. muliensis are rhomboidal type. The basal leaves are entire or pinnate. The bracts and bractlets are entire or 2-3-lobed at apex. We support that they are primitive type in Physospermopsis. The pollen grains of P. rubrinervis and P. delavayi are mainly rectangular type.

Key words: Hengduan Mountains

摘要： 本文报道滇芎属Physospermopsis H．Wolff中全叶滇芎P．alepioides、木里滇芎P．muliensis、丽江滇芎P．forrestii、紫脉滇芎P．rubrinervis、滇芎P．delavayi 5个种花粉的光学显微镜和扫描电镜研究结果。仔细分析了该属种间花粉形态的明显分化，表明横断山地区是滇芎属植物分化较活跃的区域。综合植物形态、地理分布等相关特征，讨论了滇芎属花粉由原始的菱形型至矩形型的演化趋势。

关键词: 横断山, 滇芎属, 花粉形态, 演化趋势