Producing area:Growing in the wet sandiness ground and alluvion. Origin from the southern slope of DaXingAnLing. chemical ingredient:The twig contains colophony, quercetin-monomethylether. The bark contains tannin with the content of 5.21%. Package type: Vacuum plastic bags,2.5kg/bags,10kg/carton,20kg/carton, 25kg/carton.