[Alders: The Genus Alnus in the Columbia River Gorge of Oregon and Washington]

Gray Alder, Mountain Alder, Thinleaf Alder

Alnus incana ssp. tenuifolia

Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia

Male and female catkins of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)

Male and female catkins as seen along the Klickitat Trail between the Fisher Hill Bridge and milepost 2.5, Klickitat County, WA.......February 7, 2015.

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

The photo above shows a close-up view of the upper leaf surface of mountain alder from the shoreline of the Deschutes River in the eastern Columbia River Gorge.........Spetember 29, 2007.

Ventral leaf surface of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia) - Close-up of the ventral leaf surface of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)

Close-up views of the lower leaf surface of mountain alder as seen from the shoreline of the Deschutes River in the eastern Columbia River Gorge..........Spetember 29, 2007.

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

The photo above shows a close-up view of a leaf bud of mountain alder as seen from the shoreline of the Deschutes River in the eastern Columbia River Gorge.........Spetember 29, 2007.

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

Another close-up view of the male and female catkins of mountain alder as seen from the shoreline of the Deschutes River in the eastern Columbia River Gorge..........January 24, 2016.

Paul Slichter