alnus serrulata(n = noun.plant) hazel alder, smooth alder - common shrub of the eastern United States with smooth bark;
is a kind of alder, alder tree
is a member of alnus, genus alnus

alnus, alnus crispa, alnus glutinosa, alnus incana, alnus maritima, alnus rhombifolia, alnus rubra, alnus rugosa, alnus veridis, alnus veridis crispa, alnus vulgaris, cleome serrulata, genus alnus, ochna serrulata, prunus serrulata, pteris serrulata