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牛背梁自然保护区种子植物种类丰富，约１０５ 科，４３３ 属，９５０ 种（含种下等级）。其中热带属６６ 个，温带属３１１ 个，１２ 个中国特有属以及４５９ 个中国特有种，５５ 个秦岭特有种。表明本植物区系具有明显的温带性特点及高度的特有性。古植物资料分析表明，该区植物区系的起源时间不会晚于白垩纪；植物群落的主要成分可能以原地生长的种类为主。
Niubeiliang Nature Reserve is rich in seed plants of about 105 families, 433 genera and 950 species (including species under the species). Among them, there are 66 tropical genera, 311 temperate genera, 12 endemic genera of China and 459 endemic species of China and 55 endemic species of Qinling Mountains. Show that this flora has obvious temperate characteristics and a high degree of specificity. Paleomagnetism data analysis shows that the origin of flora in this area can not be later than that of the Cretaceous. The main components of plant communities may be dominated by in situ growth.