Table 4. Similarity of the chromatograms of P. fruticosa samples from eight locations.

No.	S1	S2	S3	S4	S5	S6	S7	S8
S1	1.00
S2	0.91	1.00
S3	0.67	0.61	1.00
S4	0.73	0.57	0.79	1.00
S5	0.81	0.70	0.68	0.85	1.00
S6	0.76	0.32	0.39	0.66	0.53	1.00
S7	0.34	0.50	0.53	0.41	0.68	0.62	1.00
S8	0.27	0.46	0.38	0.52	0.21	0.31	0.56	1.00

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.