| Noun | 1. | subclass Hamamelidae - a group of chiefly woody plants considered among the most primitive of angiosperms; perianth poorly developed or lacking; flowers often unisexual and often in catkins and often wind pollinated; contains 23 families including the Betulaceae and Fagaceae (includes the Amentiferae); sometimes classified as a superorder class - (biology) a taxonomic group containing one or more orders hamamelid dicot family - family of mostly woody dicotyledonous flowering plants with flowers often unisexual and often borne in catkins hamamelid dicot genus - genus of mostly woody relatively primitive dicotyledonous flowering plants with flowers often unisexual and often borne in catkins class Dicotyledonae, class Dicotyledones, class Magnoliopsida, Dicotyledonae, Dicotyledones, Magnoliopsida - comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae Fagales, order Fagales - an order of dicotyledonous trees of the subclass Hamamelidae Amentiferae, group Amentiferae - used in some classification systems for plants that bear catkins genus Hamamelidanthum, Hamamelidanthum - genus of fossil plants of the Oligocene having flowers resembling those of the witch hazel; found in Baltic region genus Hamamelidoxylon, Hamamelidoxylon - genus of fossil plants having wood identical with or similar to that of the witch hazel genus Hamamelites, Hamamelites - genus of fossil plants having leaves similar to those of the witch hazel family Hamamelidaceae, Hamamelidaceae, witch-hazel family - comprises genera Hamamelis, Corylopsis, Fothergilla, Liquidambar, Parrotia, and other small genera |