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VARIATION PATTERNS ON INNER SPECIES OF CISTANCHE DESERTICOLA A PRIMARY STUDY ON THE RADIAL VARIATION PATTERNS OF WOOD PROPERTIES WITHIN TREES V.THE RADIAL VARIATION PATTERNS AND ITS VARIATION OF WOOD FIBRE LENGTH OF 15 CLONES OF POPULUS×EURAMERICHANA VARIATION PATTERNS ON MICRO-MORPHOLOGICAL CHARACTERISTICS OF LEMMAS OF AGROPYRON MONGOLICUM A taxometric analysis of the variation patterns of characters of Fritillaria przewalskii (Liliaceae) Variation Patterns and Systematics of the Widespread Species Epilobium angustifolium L.(Onagraceae) in China