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(一)水青树(Tetracen tron sinensis)属水青树科,落叶乔木,为我国特有种,系第四纪孑遗植物。从其木材结构来看,具有被子植物和裸子植物的某些特征,是研究植物发展进化的活化石。该树种在秦岭南坡分布于海拔1400～2200米的沟溪两旁的杂木林中。由于在森林采伐过程中没有注意这一珍稀树种的保护,种群日趋减少。1982年10月,我们于宁西林业局菜子坪林场采集水青树种子进行
(A) Tetracen tron sinensis is a hydrophyte family, deciduous trees, endemic to China, Department of Quaternary relict plants. In terms of its wood structure, certain features of angiosperms and gymnosperms are living fossils for studying the evolution of plants. The tree species are distributed on the south slope of the Qinling Mountains in the mixed woods on both sides of the Ditch Creek, 1400 ~ 2200 meters above sea level. Due to the neglect of the protection of this rare species in the process of forest harvesting, the population is declining. In October 1982, we collected the acacia seeds in Caizi Ping Forest Farm of Ningxi Forestry Bureau