thorny shrubs and small trees: hawthorn; thorn; thorn apple
造句
Chemical constituents from leaves of Crataegus pinnatifida Bge. 山楂葉的化學成分。
Any of various usually thorny trees or shrubs of the genus Crataegus having clusters of white or pinkish flowers and reddish fruits containing a few one-seeded nutlets. 山楂一種山楂屬喬木或灌木，通常帶刺，有白色或粉色花簇和微紅色內有一些單籽小核的果實。