This study was conducted for fully understanding of gutta-percha content characters in samaras from different variance-types, which as a result provided theoretical guidance for selections of valuable resources and effective utilization of Eucommia ulmoides. Typical sample-tree selection and random selection were applied and integrated extraction was used for the gutta-percha content rate test in this study. The result showed that there existed remarkable differences of samara＇ s shape and size among four main variance-types. These differences...
