Gattung: Alnus Mill.
Familie: Betulaceae
Arten: knapp 40
Vorkommen: Europa, Asien, N-Amerika. Alnus jorullensis in S-Amerika

Arten:
Alnus acuminata Kunth
Alnus acuminata subsp. acuminata.
Alnus acuminata subsp. arguta (Schltdl.) Furlow
Alnus acuminata subsp. glabrata (Fernald) Furlow
Alnus cordata (Loisel.) Loisel.
Alnus cremastogyne Burkill
Alnus × elliptica Req.
Alnus × fallacina Callier
Alnus fauriei H.Lév. & Vaniot
Alnus ferdinandi-coburgii C.K.Schneid.
Alnus firma Siebold & Zucc.
Alnus formosana (Burkill) Makino
Alnus glutinosa (L.) Gaertn.
Alnus glutinosa subsp. antitaurica Yalt
Alnus glutinosa subsp. barbata (C.A.Mey.) Yalt.
Alnus glutinosa subsp. betuloides Ansin
Alnus glutinosa subsp. glutinosa.
Alnus glutipes (Jarm. ex Czerpek) Vorosch.
Alnus hakkodensis Hayashi
Alnus × hanedae Suyinata
Alnus henryi C.K.Schneid.
Alnus hirsuta (Spach) Rupr.
Alnus × hosoii Mizush. J.
Alnus incana (L.) Moench
Alnus incana subsp. incana.
Alnus incana subsp. kolaensis (Orlova) Á.Löve & D.Löve
Alnus incana subsp. rugosa (Du Roi) R.T.Clausen
Alnus incana subsp. tenuifolia (Nutt.) Breitung
Alnus japonica (Thunb.) Steud.
Alnus jorullensis Kunth
Alnus jorullensis subsp. jorullensis.
Alnus jorullensis subsp. lutea Furlow
Alnus lanata Duthie ex Bean
Alnus mairei H.Lév.
Alnus mandshurica (Callier) Hand.-Mazz.
Alnus maritima (Marshall) Muhl. ex Nutt.
Alnus matsumurae Callier
Alnus maximowiczii Callier
Alnus × mayrii Callier
Alnus nepalensis D.Don
Alnus nitida (Spach) Endl.
Alnus oblongifolia Torr.
Alnus orientalis Decne.
Alnus paniculata Nakai
Alnus × peculiaris Hiyama
Alnus pendula Matsum.
Alnus × pubescens Tausch
Alnus rhombifolia Nutt.
Alnus rubra Bong
Alnus serrulata (Aiton) Willd.
Alnus serrulatoides Callier
Alnus sieboldiana Matsum.
Alnus subcordata C.A.Mey.
Alnus × suginoi Sugim.
Alnus trabeculosa Hand.-Mazz.
Alnus vermicularis Nakai
Alnus viridis (Chaix) DC.
Alnus viridis subsp. crispa (Aiton) Turrill
Alnus viridis subsp. fruticosa (Rupr.) Nyman
Alnus viridis subsp. sinuata (Regel) Á.Löve & D.Löve
Alnus viridis subsp. suaveolens (Req.) P.W.Ball
Alnus viridis subsp. viridis.