中文摘要：

为探讨民族植物学在城市乡土挺水观赏植物筛选中的应用价值,以江苏扬州为研究区域,在对该地区挺水植物分布概况调查的基础上,对该地区挺水植物的观赏价值进行评价,以期筛选出具有较高观赏价值的乡土挺水植物来代替相应的外来观赏植物。结果发现扬州地区共有常见挺水植物93种,隶属于28科,62属,其中莎草科（Cyperaceae）、禾本科（Gramineae）和蓼科（Polygonaceae）植物种类数较丰富,占总种数的50%。在综合利用价值评价结果的基础上应用民族植物学方法对20种很少或尚未被应用的扬州乡土挺水植物的观赏价值进行了比较,结果表明不同植物在群体水平和个体水平上的观赏价值存在差异,在个体水平上观赏价值较高的为水烛（Typha angustifolia）、鸭舌草（Monochoria vaginalis）和毛草龙（Ludwigia octovalvis）等,在群体水平上观赏价值较高的为蚕茧草（Polygonum japonicum）、水烛和水葱（Scirpus validus）等。

英文摘要：

In this study, Yangzhou was selected as the study area to investigate the application of ethnobotany in the selection of indigenous emergent ornamental plants. We studied the emergent plants resources in this area and evaluated their ornamental values with the ethnobotanical methods. As showed in our results, there are about 93 species of emergent plants in this area, which belong to 62 genera and 28 families. The three species-rich families are Cyperaceae, Gramineae and Polygonaceae, accounting for 50% of the total species. According to their values of comprehensive utilization, we chose 20 indigenous species which were seldom or never used in the construction of urban landscapes and sorted them further with the ethnobotanical methods. As a result, the ornamental value was quite different at the individual level and population level for one species. For example, Typha angustifolia, Monochoria vaginalis, Ludwigia octovalvis etc. had higher composite salience values at the individual level, and Polygonum japonicum, Typha angustifolia, Scirpus validus etc. had higher composite salience values at the population level.