Alder

Alder; Temporal range:
	Common alder (Alnus glutinosa)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fagales
Family:	Betulaceae
Subfamily:	Betuloideae
Genus:	; Mill.
Type species
	Alnus glutinosa; (L.) Gaertn.
Synonyms
	Genus synonyms Betula-alnus Marshall ; Duschekia Opiz ; Alnaster Spach ; Clethropsis Spach ; Semidopsis Zumagl. ; Alnobetula (W.D.J.Koch) Schur. ; Cremastogyne (H.J.P.Winkl.) Czerep. ;

Alders are trees of the genus Alnus in the birch family Betulaceae. The genus includes about 35 species^[2] of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species extending into Central America, as well as the northern and southern Andes.^[1]

^ ^a ^b "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org.
^ Arno, Stephen F.; Hammerly, Ramona P. (2020) [1977]. Northwest Trees: Identifying & Understanding the Region's Native Trees (field guide ed.). Seattle: Mountaineers Books. pp. 208–215. ISBN 978-1-68051-329-5. OCLC 1141235469.

[KewChecklist-1] "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org.

[Arno-2020-2] Arno, Stephen F.; Hammerly, Ramona P. (2020) [1977]. Northwest Trees: Identifying & Understanding the Region's Native Trees (field guide ed.). Seattle: Mountaineers Books. pp. 208–215. ISBN 978-1-68051-329-5. OCLC 1141235469.

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