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Comparison of Germination Strategies of Artemisia ordosica with Its Two Congeners from Deserts of China and Israel THE PRELIMINARY STUDY ON THE MICROMORPHOLOGICAL FEATURES OF ACHENE SURFACES OF SAUSSUREA BET HEDGING IN HETEROMORPHIC ACHENES OF HETERACIA SZOVITSII (ASTERACEAE), A DESERT EPHEMERAL Micromorphological Features of Achene Surfaces of 16 Species Of Subgen Saussurea in the Eastern of the Qinghai-Tibet Plateau Supplementary description of achenes of seven species in Elatostema(Urticaceae)