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