The Classification Research Of Onagraceae In Gansu Province

Onagraceae is one of the far-ranging families in a wet environment, with high medicinal value, aesthetic value and industrial value.There are seventeen genera and ca.650 species in the world,and seven genera (two introduced),65 species (11 endumic,11introduced),and five natural hybrids(two endemic) in China. In order to fill the gaps in the research of Onagraceae in Gansu province, All the species of Onagraceae were tried to recognize in Gansu province based on herbarium examinations of more than thousands specimens from CVH and 4 herbarias (abbreviated as WUK,GAUF,NWTC and College of Pharmacy medicinal plants herbarium specimen room in Lanzhou University),literatures, additional filed work,collection,identification and pictures,they had also contributed to reveal that there are 7 genera and 36 species (including 32 species and four subspecies) in Gansu provice,of which one species are new records in Gansu; three genera and 20species can be medicinal, and some can also be ornamental plants and industrial materials.According to the description norms of the morphological characteristics,they had sorted the particular morphological characteristics, original place, distribution and habitats of each species.especially the particular morphological characteristics,they was carried out systematically, completely and concisely.Meanwhile,based on the materials of classification,the Keys to genus and species of Onagraceae in Gansu provice were established. Finally, with the style-microscope imaging system,some fine morphological structure of the species surface were observed. The results supported the previous views to deviding Epilobium into Chamaenerion and Epilobium, further clarified the morphological characteristics between Chamaenerion angustifolium L. subsp. angustifolium and Chamaenerion angustifolium L. subsp. circumvagum et.. This research provides some theoretical references for the subsequent investigations and studies.