OBJECTIVE:To identify the crude drugs ,Chuanmutong(a traditional Chinese materia medica),originated from 4 species of genus Clematis which are often used in Sichuan province,based on stem morphological and histological characters.

• 目的:研究四川作川木通入药的4种铁线莲属植物(小木通、粗齿铁线莲、钝萼铁线莲和绣球藤)茎的性状和组织构造。