[Deciduous Trees and Shrubs of Denali National Park and Preserve]

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

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

Close-up views of the upper leaf surface (left) and lower leaf surface (right) of mountain alder.

Leaf of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia) - Leaf bud 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 upper leaf surface and a leaf bud of mountain alder.

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) - 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.

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

Mountain alder growing in a sedge meadow.

Leaves of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia) - Lower leaf surface of Gray Alder, Mountain Alder, Thinleaf Alder: Alnus incana ssp. tenuifolia (Synonyms: Alnus incana var. occidentalis, Alnus rugosa, Alnus tenuifolia)

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

Additional photos of mountain alder growing in a riparian area.
Paul Slichter