Table 2. Results of analysis of molecular variance for Ephedra przewalskii based on chloroplast DNA sequence data.

Source of variation	d.f.	Sum of squares	Variance components	Percentage of variation (%)
Among populations	44	318.227	0.6835	86.21*
Within populations	424	46.374	0.1094	13.79
(1–12, 25, 30–31) vs. (13–16) vs. (17–18) vs. (19–20) vs. (21) vs. (22–24, 27–29) vs. (26) vs. (32) vs. (33–35) vs. (36–44) vs. (45)
Among groups	10	313.467	0.8228	87.99*
Among populations within groups	34	4.760	0.0029	0.31*
Within populations	424	46.374	0.1094	11.70*
Geographic regions
Among geographic regions	7	170.552	0.4103	46.05*
Among populations within regions	37	147.675	0.3713	41.68*
Within populations	424	46.374	0.1094	12.17*

* P < 0.001