Genus: Alnus

Alnus - Alder

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Not peer reviewed

Last Modified 01/29/2013

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Alnus Mill., Gard. Dict. Abr. ed. 4., v.1 [“AL”]. 1754. LECTOTYPE: Alnus vulgaris Hill (=Alnus glutinosa (L.) Gaertn.) designated by Britton & Brown (1913).

Key to the species of Alnus

1. Single-trunked tree...Alnus glutinosa
1. Multi-stemmed shrub...2

2. Leaves doubly serrate, undersides not resin-coated; bark dark grayish to reddish-brown, with prominent whitish lenticels...Alnus incana
2. Leaves simply serrate or serrulate, undersides resin-coated; bark light gray, without prominent lenticels...3

3. Leaves serrate, mostly ovate, apices acute...Alnus viridis
3. Leaves serrulate, mostly obovate, apices rounded...Alnus serrulata

List of Alnus Species

References to Alnus

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