Investigation on material plants of Litsea coreana in Guizhou.

The material plants resource for making Laoying tea in Xifeng,Meitan,Suiyang and Chishui counties of Guizhou provinces was investigated by interview and quadrat survey methods to know its production and utilization.The results showed that main material plants for making Laoying tea were Litsea coreana.var.lanuginose and Actinodaphne cupularis,and the folk Laoying tea was mainly made of young leaves of Litsea coreana.The population quantity of Litsea coreana is in imminent danger because of excessive picking and loss of its seed regeneration ability.