alnus incana(n = noun.plant) gray alder, grey alder - native to Europe but introduced in America;
is a kind of alder, alder tree
is a member of alnus, genus alnus

alnus, alnus crispa, alnus glutinosa, alnus maritima, alnus rhombifolia, alnus rubra, alnus rugosa, alnus serrulata, alnus veridis, alnus veridis crispa, alnus vulgaris, berteroa incana, genus alnus, matthiola incana, quercus incana