Gray Alder, Mountain Alder, Thinleaf Alder, Thin-leaf Alder
Alnus incana ssp. tenuifolia
Synonyms: Alnus incana var. occidentalis, Alnus incana var. virescens, Alnus x purpusii, Alnus tenuifolia
- ![Ventral leaf surface of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)](tenuifolia6b.jpg)
Close-up views of the upper leaf surface (left) and lower leaf surface (right) of mountain alder as seen from seeps along the Canyon Mountain Trail #218, Strawberry Mountain Wilderness.........August 19, 2011.
- ![Leaf bud of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)](../../../../../../../gorge/tree/broadlf/alnus/incana/tenuifolia1c.jpg)
Close-up views of the upper leaf surface and a leaf bud of mountain alder as seen from the shoreline of the Deschutes River in the eastern Columbia River Gorge..........September 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)](../../../../../../../gorge/tree/broadlf/alnus/incana/tenuifolia1a.jpg)
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..........September 29, 2007.
![Leaves and maturing cones of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus incana var. virescens, Alnus x purpusii, Alnus tenuifolia)](tenuifolia05-11-2018.jpg)
Mountain alder leaves as seen at the crossing of Whychus Creek along the Alder Springs Trail #855, Crooked River National Grasslands.......May 11, 2018.
- ![Leaves and stem of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)](tenuifolia7b.jpg)
Mountain alder growing in a sedge meadow along Summit Creek where it crosses Forest Service Road 1647, Malheur National Forest.........August 4, 2011.
- ![Leaf underside of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus incana var. virescens, Alnus x purpusii, Alnus tenuifolia)](tenuifolia06-22-2017b.jpg)
Mountain alder growing along the Line Butte Trail #807 on the southern slopes of Lookout Mountain, Ochoco National Forest..........June 22, 2017.
![Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus incana var. virescens, Alnus x purpusii, Alnus tenuifolia)](tenuifolia07-12-2017.jpg)
Ventral leaf surface of mountain alder as seen at
Potter Meadows across Forest Road 38 from the southern trailhead for the Ochoco Mountain Trail, Ochoco National Forest.........July 13, 2017.
- ![Lower leaf surface of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)](tenuifolia8b.jpg)
- ![Leaves and catkins of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)](tenuifolia8d.jpg)
Additional photos of mountain alder growing along Forest Service Road #16 at Big Creek in Logan Valley, Malheur National Forest.........August 20, 2011.
![Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus incana var. virescens, Alnus x purpusii, Alnus tenuifolia)](tenuifolia05-27-2018.jpg)
Mountain alder observed along Indian Creek at the northwest corner of Big Summit Prairie, Ochoco National Forest.......May 27, 2018.
Paul Slichter