The Morphology of the Dichotomous Leaf Venation of Circaeaster agrestis and Its Systematic Implication THE DISCOVERY OF THE BILACUNAR NODES AND BILOBED LEAVES IN CIRCAEASTER AND THEIR SISTEMATIC SIGNIFICANCE Morphological Studies on Circaeaster agrestis Maxim. (1) Process of Embryolo gical Development Karyomorphology and Relationships of the Genus Circaeaster Maxim. Anatomical Studies on Hypocotyl of Circaeaster Approaches to thesystematic position of Circaeaster based on the morphological data