Responses of Three Native Shrubs to Drought Stress in Urumqi Physiological responses of two native shrub seedlings to drought and salt stress Seed Dormancy-breaking and Germination Requirements of Two Atraphaxis Species Tertiary montane origin of the Central Asian flora, evidence inferred from cpDNA sequences of Atraphaxis (Polygonaceae) A Study of the Genus Atraphaxis in China and the System of Atraphaxideae (Polygonaceae) Effects of seed maturation time and dry storage on germination of two Atraphaxis species