STUDIES ON NUMERICAL CLASSIFICATION OF ROSE CULTIVARS Investigation and Classification of Cultivars of Crape Myrtle (Lagerstroemia indica) in Shandong Province Comparison of Pollen Morphology of Tree Peony Cultivar Groups Studies on Dynamic Characteristics of the Pigment Components of Ornamental Crabapple Cultivars Groups in Flowering Process A New System for Classify ing China Mei Cultivar Groups , with SpecialReference to Developing Super ior ities of Interspecific Hybrid OriginatedGroups Studies on Flowering Phenological Characteristics of Ornamental Crabapple Cultivar Group Studies on Dynamic Characteristics of the Pigment Components of Ornamental Crabapple Cultivars Groups in Flowering Process A New System for Classify ing China Mei Cultivar Groups , with SpecialReference to Developing Super ior ities of Interspecific Hybrid OriginatedGroups THE CLUSTER ANALYSIS OF ASPARAGUS BEAN GERMPLASM Studies on Flowering Phenological Characteristics of Ornamental Crabapple Cultivar Group