ibclogo XVI International Botanical Congess


Abstract Number: 5698
Poster No. = 896


SYSTEMATICS OF THE TRIBE HYOSCYAMEAE (SOLANACEAE)


Zhi-yun Zhang and An-ming Lu Laboratory of Systematic & Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China


The tribe Hyoscyameae of Solanaceae comprises seven genera and about 40 species with great medicinal value. In the present paper, the gross morphology, seed morphology, palynology, embryology and primary molecular systematics of this tribe are synthetically studied. The origin, differentiation, dispersal and systematic relationships are also discussed according to the principle of the unity between the phylogeny and distribution of plants. The result indicates that the seed and pollen morphological characters are of certain value for classification of genera. The embryological characters of the genus Przewalskia Maxim. is similar to most groups of the Solanaceae. The distributional center of this tribe is confined to the Hengduan Mountains (Yongtze-Makong-Salwin divides) and adjacent areas of southwest China. The origin time may date back to at least as early as the early Tertiary or the late Cretaceous. The differentiation and dispersal of this tribe are closely related to the tectonic and climatic changes, especially to the climatic changes during the late Tertiary, the Quaternary glaciation and the uplift of the Himalayas.


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