[Broadleaf Trees and Shrubs of the Columbia River Gorge]

Alders of the Columbia River Gorge of Oregon and Washington

The Genus Alnus

California Alder, White Alder: Alnus rhombifolia (Synonym: Alnus rhombifolia var. bernardina)

Male and female catkins of white alder (Alnus rhombifolia) in bloom along the Deschutes River, Deschutes River State Campground......January 29, 2021. Note the appearance and postion of the male and female catkins.

Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia) -

California Alder, White Alder: Alnus rhombifolia (Synonym: Alnus rhombifolia var. bernardina) -

Oregon Alder, Red Alder: Alnus rubra (Synonyms: Alnus oregona, Alnus oregona var. oregona, Alnus oregona var. pinnatisecta, Alnus rubra var. pinnatisecta) -

Green Alder, Siberian Alder, Sitka Alder, Slide Alder, Wavy-leaf Alder, Wavy-leaved Alder: Alnus viridis ssp. sinuata (Synonyms: Alnus alnobetula, Alnus alnobetula ssp. sinuata, Alnus crispa ssp. laciniata, Alnus crispa ssp. sinuata, Alnus sinuata, Alnus sitchensis, Alnus viridis ssp. fruticosa, Alnus viridis var. sinuata, Duschekia sinuata) - Note: This species is known as Alnus alnobetula ssp. sinuata in Oregon.

Paul Slichter E-mail