【摘要】 经初步调查分析 ,陕西宁强汉江源头段共有水生维管植物 40种 ,包括蕨类植物 1种 ,种子植物 39种 ,分别隶属于 2 0科 2 7属 .其中挺水植物 2 5种 ,浮水及浮叶植物4种 ,沉水植物 11种 .39种种子植物分属于 2 6属 ,有 7种地理分布类型 ,其中以世界分布类型成分居多 ,共 11属 19种 ;热带分布类型成分 8属 8种 ;温带分布类型 7属 12种 .调查分析发现 6种该区域的新分布种 ,即 :竹叶眼子菜、小浮叶眼子菜、小茨藻、大茨藻、水毛花和狸藻 ;新记录属 2个 ,即 :茨藻属和狸藻属 ;新记录科 1个 ,即 :茨藻科更多还原

【Abstract】 Based on the preliminary survey and analysis, there are 40 species water vascular plants which include 1 species pteridophyte, 39 species seed plants and belong to 20 families 27 genera at the source of the Han River in Ningqiang county. In these plants, 25 species belong to straight hydrophyte, 4 species belong to hydrophyta natantia and 11 species are submersed plant. The 39 species seed plants belong to 26 genera and 7areal type of genera of seed plants. There are 11 genera 19 species which belong to cosmopolitan type, 8 genera 8 species belong to the tropical type and 7genera 12 species belong to the temperate type. Through analysis we have discovered That 6 species are new recorded to this region which are Potamogeton crispus, P. vaseyi, Najas minor, N.marina,, Scirpus triangulates and Utricularia vulgaris. There is one of new recorded family that is Najadaceae, two new recorded genera which are Najas and Utricularia.更多还原