It is pointed out in the paper that there are 15 species(including 3 variety)of Quercus distributing among Cheng Ling Mountains,of which 6 species(including 2 variety) aer poisonous to cattle.

• 本文指出,分布于秦岭山区的15种栎属植物(其中包括3个变种),迄今已确定6种(包括2个变种)对牛有毒。