Alnus acuminata Kunth, Nov. Gen. Sp. 2: 20. 1817 sec. Christenhusz 2009
- =Alnus acuminata Kunth subsp. acuminata, Nov. Gen. Sp. 2: 20. 1817 syn. sec. ???
- =Alnus ferruginea Kunth, Nov. Gen. Sp. (quarto ed.) 2: 21. 1817 syn. sec. Christenhusz 2009
- =Alnus arguta (Schltdl.) Spach in Ann. Sci. Nat., Bot. II, 15: 205. 1841 syn. sec. Christenhusz 2009
- =Alnus pringlei Fernald in Proc. Amer. Acad. Arts 43: 62. 1907 syn. sec. Christenhusz 2009
- =Alnus ovalifolia Bartlett in Proc. Amer. Acad. Arts 44: 611. 1909 syn. sec. Christenhusz 2009
- =Alnus guatemalensis Gand. in Bull. Soc. Bot. France 66(7): 289. 1920 ["1919"] syn. sec. Christenhusz 2009