According to the query Fazhan Agriculture Network learned that the greenoka wood is the greenoka tree, also known as the acorn tree, which is an evergreen tree of the family Crustaceae, will bloom in May each year, its flowers show yellowish-green color, and the greenoka wood is a subtropical tree species, the response to the climatic conditions is more sensitive to the leaves before the rain will turn red, widely distributed in China's Yangzhou, Nanjing, Suzhou and other places.

The greenoka tree, deciduous trees of the genus Quercus in the family Crustacea, 30 meters high. Branchlets coarse and glabrous; leaves long elliptic-obovate, with undulate obtuse teeth glabrous; fruit cupular, gray-white pubescent; male flowers clustered on the inflorescence axis, female inflorescences born in the leaf axils; flowering period in March-May, fruiting period in September-October.