NEW SPECIES FROM SHANDONG Two new synonyms of Ulmaceae in Henan, China EFFECTS OF SITE CONDITIONS ON MINERAL ELEMENT CONTENTS IN THE BARK OF WINGCELTIS (PTEROCELTIS TATARINOWII) Chloroplast phylogeography of a temperate tree Pteroceltis tatarinowii (Ulmaceae) in China Morpholog ica l Var ia tion among D ifferent Sources of P te roce ltis ta ta rinow iiin Warm Tempera te Zone Natural Regeneration Characteristics of Celtis sinensis Population in Langqi Island Scenic Spot of Minjiang Estuary, Fujian Province The genetic structure of endemic plant Pteroceltis tatarinowii by ISSR markers Photosynthetic Characteristics and Chlorophyll Fluorescence Parameters of Celtis sinensis and Ulmus pumila L. Seedling under Salt Stress New Taxa of the Genus Celtis from Yunnan Ecological Characteristics of Shivaphis pteroceltis (Hemiptera: Aphididae), A New Pest on Pteroceltis tatarinowii Leaf Comparation on Anatomical Structure and Epidermal Characteristics of Pteroceltis tatarinowii Maxim. in Different Areas Composition of Bark Fiber of Wild Pteroceltis tatarinowii in Daguisi National Forest Park Spatial Pattern of Pteroceltis tatarinowii Populations in Langya Moutain of Anhui Province Population Structure and Spatial Distribution Pattern of Celtis sinensis in Fangshan of Nanjing Community character of Celtis sinensis of Fangshan National Geological Park in Nanjing Biology of Shivaphis pteroceltis (Hemiptera: Aphididae), A New Pest of Pteroceltis tatarinowii Population structure and spatial distribution pattern of Pteroceltis tatarinowii in Langyashan Mountain of Anhui Province Effect of Ca2+ concentration on the growth and bark quality of Pteroceltis tatarinowii Effect of Soil Drying-Wetting Alternation on Physiology and Growth of Pteroceltis tatarinowii Seedlings