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.delavayi5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。
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 Malla, and P. muktinathensis Farille et Malla are endemic in the Himalayas and with two species i.e. P. obtusiuscula (Wall, ex DC.) Norman, P. rubrinervis (Franchet) Norman widely distributed in both of the Himalayas and the Hengduan mountains of China. There are five species 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 altitudes 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. The basal leaves 2-pinnate. The bracts are pinnateand the bractlets trilobed at apex. These characteristics support the suggestion that they are advanced taxon in this genus. P. forrestii is mainly rhomboidal and rarely rectangular type. The basal leaves are 1-2-pinnate. The bracts and bractlets share incised-dentata. This species appear to be intermediat between above two taxa.
出处
《云南植物研究》
CSCD
1992年第4期413-417,共5页
Acta Botanica Yunnanica
关键词
横断山
滇芎属
花粉形态
演化趋势
Hengduan Mountains
Physospermopsis
Pollen morphology
Evolution trend
