Micropropagation of Canadensis Redbud in vitro Study on Breaking the Seed Dormancy and Stimulating the Seed Germination for Cercis chinensis Studies on chemical constituents of Cercis chinensis LEAF VENATION OF CERCIDEAE(LEGUMINOSAE) A New Stilbene from Cercis chinensis Bunge SCANNING ELECTRON MICROSCOPIC STUDY OF SEEDCOAT PATTERNS IN CERCIS L. (LEGUMINOSAE) A Phylogenetic and Biogeographic Study of Cercis (Leguminosae) A REVISION OF CERCIS FROM HENAN