1, elm (scientific name: UlmuspumilaL.): also known as spring elm, white elm, etc., known as "elm pimple", for the elm family deciduous trees, young trees with smooth bark, gray-brown or light gray, the bark of the large trees is dark gray, irregular longitudinal, rough; twigs are glabrous or hairy, no expanded cork layer and raised corky wings. and raised corky wings; winter buds subglobose or ovoid.

2, toon (scientific name: Toonasinensis), also known as toon buds, fragrant pile head, big red toon tree, toon days, etc., in Anhui area also called spring seedlings. Root has two layers of skin, also known as toon white skin, native to China, distributed in the Yangtze River north and south of a wide range of areas, for neem family. Deciduous tree, dioecious, leaves are even pinnately compound, panicle, bisexual flowers white.