World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew

Betula alnus var. rugosa Du Roi, Diss. Inaug. Obs. Bot.: 32 (1771).

This name is a synonym.

Homotypic Names:
Accepted Name:	Alnus incana subsp. rugosa (Du Roi) R.T.Clausen, Cornell Univ. Agric. Exp. Sta. Mem. 291: 8 (1949).
Family:	Betulaceae
Betula rugosa (Du Roi) Ehrh., Beitr. Naturk. 3: 21 (1788). Alnus rugosa (Du Roi) Spreng., Syst. Veg. 3: 848 (1826). Alnus glutinosa lusus rugosa (Du Roi) Regel, Nouv. M�m. Soc. Imp. Naturalistes Moscou 13(2): 165 (1861). Alnus serrulata var. rugosa (Du Roi) Regel, Bull. Soc. Imp. Naturalistes Moscou 38(II): 432 (1865). Alnus incana subsp. rugosa (Du Roi) R.T.Clausen, Cornell Univ. Agric. Exp. Sta. Mem. 291: 8 (1949).
Original Compiler:	R.Govaerts