Abstract: Seed morphology was observed and effects of substance types, light, destroying the endocarp artificially and gradient pH on germination percentage of the species, N. yunnanensis, were investigated . The results showed that the average seed size with endocarp was 0 . 94 cm×0. 52 cm×0. 17 cm ( length×width×thickness) , per-thousand-seed-weight about 234.3 g , with germination valve. Among the three substance types, laterite humus soil􊄯peat (v􊄯v􊄯v , 1∶1∶1) was better for N. yunnanensis . Seeds could germinate in the both light and dark , the germination rate can be increased by destroying the endocarp artificially obviously, and the seed germination of N. yunnanensis was stunted by treated in lye , however , that of N. sinensis was promoted . Besides, the rarity causes of N. yunnanensis were discussed in this paper .

Key words: Nyssa yunnanensis