Figure 2: Differences of active ingredient contents in the leaves of P. fruticosa in different growing locations.

For the same variable, bars with no letters in common are significantly different (P < 0.05). YT (%), tannin content; YF (%), total flavonoids content; YR (%), rutin content; YP (%), total phenolics content. S1, Mei county, Shaanxi; S2, Diebu, Gansu; S3, Huzhu, Qinghai; S4, Jingyuan, Ningxia; S5, Yongdeng, Gansu; S6, Shangri-la, Yunnan; S7, Ningchi, Tibet; S8, Kangding, Sichuan.