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Alnus -
by Jingshuang Ma
Not peer reviewed
Last modified: 06/15/2006
Nomenclature
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