gray alder (Alnus incana subsp. incana)

Grey Alder (Alnus incana (L.) Moench)

thinleaf alder (Alnus incana subsp. tenuifolia (Nutt.) Breitung)

speckled alder (Alnus incana subsp. rugosa (Du Roi) R. T. Clausen)

Alnus incana subsp. kolaensis (Orlova) Á. Löve & D. Löve

Alnus incana f. emersoniana

Alnus incana f. chamaedryoides

Alnus glutinosa × Alnus incana

Alnus alnobetula × Alnus incana

Alnus glutinosa × Alnus incana

Alnus incana f. semipinnata

Alnus incana var. hypomalaca

Alnus incana f. laceratifolia

Alnus incana ssp. incana

Alnus incana var. virescens S. Watson

Alnus incana var. virescens S. Watson

Alnus hirsuta (Spach) Rupr.

Alnus matsumurae Callier

Oregon Alder (Alnus rubra Bong.)

Alnus pubescens Tausch

Brookside alder (Alnus serrulata (Aiton) Willd.)

birch (Betula)