Sixteen varieties of Alder are used Medicinally: Alnus cordata - Italian Alder, Alnus glutinosa, Alnus hirsute, Alnus incana - Grey Alder, Alnus japonica - Japanese Alder, Alnus maritima - Seaside Alder, Alnus maximowiczii Family, Alnus nepalensis - Nepalese Alder, Alnus nitida, Alnus rhombifolia - White Alder, Alnus rubra - Red Alder, Alnus rugosa - Speckled Alder, Alnus serrulata - Smooth Alder, Alnus sinuata - Sitka Alder, Alnus tenuifolia - Mountain Alder, Alnus viridis crispa - American Green Alder