| Alnus alnobetula | 
|  | 
|  | 
|  | 
| Scientific classification | 
| Kingdom: | Plantae | 
 
| Clade: | Tracheophytes | 
 
| Clade: | Angiosperms | 
 
| Clade: | Eudicots | 
 
| Clade: | Rosids | 
 
| Order: | Fagales | 
 
| Family: | Betulaceae | 
 
| Genus: | Alnus | 
 
| Subgenus: | Alnus subg. Clethropsis | 
| Species: | A. alnobetula | 
| Binomial name | 
| Alnus alnobetula 
 (Ehrh.) K.Koch | 
|
|  | 
| Natural distribution of Alnus viridis complex | 
| Synonyms | 
| 
Alnus viridis A.Gray 1848, illegitimate homonym, not (Chaix) DC. 1805
Alnus fruticosa Rupr.
Alnaster fruticosus (Rupr.) Ledeb.
Duschekia fruticosa (Rupr.) Pouzar
Alnus pumila Nois. ex Corrie
Alnus orbiculata Lopylaie ex Spach
Alnus tristis Wormsk. ex Regel 
Alnus alpina Vill.
Betula viridis Chaix in D.Villars
Betula ovata Schrank
Betula alpina Borkh. ex Theorin
Alnus viridis (Chaix) DC. 
Alnus ovata (Schrank) G.Lodd.
Alnaster viridis (Chaix) Spach
Semidopsis viridis (Chaix) Zumagl.
Duschekia ovata (Schrank) Opiz
Duschekia viridis (Chaix) Opiz
Alnus brembana Rota
Alnus corylifolia A.Kern. ex Dalla Torre
Betula crispa Aiton
Alnus crispa (Aiton) Pursh
Alnaster crispus (Aiton) Czerep.
Duschekia crispa (Aiton) Pouzar
Alnus undulata Willd.
Betula alnus-crispa Steud.
Alnus mitchelliana M.A.Curtis ex A.Gray
Alnus repens Wormsk. ex Hornem. 
Alnus mollis Fernald
Alnus viridis var. sinuata Regel
Alnus sinuata (Regel) Rydb.
Duschekia sinuata (Regel) Pouzar
Alnaster sinuatus (Regel) Czerep.
Betula tristis Wormsk. ex Link
Alnus sitchensis (Regel) Sarg
Alnus kamschatica (Regel) Kudô ex Masam
Duschekia kamtschatica (Callier) Pouzar
Alnaster kamtschaticus (Callier) Czerep.
Alnus suaveolens Req.
 | 
Alnus alnobetula is a common tree widespread across much of Europe, Asia, and North America. Many sources refer to it as Alnus viridis, the green alder, but botanically this is considered an illegitimate name synonymous with Alnus alnobetula subsp. fruticosa.