Oregon Alder, Red Alder
Alnus rubra
Synonyms: Alnus oregona, Alnus oregona var. oregona, Alnus oregona var. pinnatisecta, Alnus rubra var. pinnatisecta
Leaves, the past season's female cones, and next spring's male catkins observed on a red alder along the Willapa Hills Trail near the bridge over the Chehalis River gorge......November 16, 2022.
Close-up of the upper leaf surface of red alder. Note the smaller teeth on the edges of the larger teeth.
Close-up of the leaf edge on the ventral surface of the leaf blade of red alder. The margin on this species is rolled downwards as evident here.
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Close-ups of the male catkins and lateral leaf buds of red alder as seen along the Springwater Trail at Powell Butte to the west of Gresham, Oregon........March 8, 2012.
Red alder with male catkins forming and last year's female cones present on the branches as seen along the Springwater Trail east of Gresham, Oregon.......February 3, 2012.
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Close-up images of the upper leaf surface (left) and inrolled margin seen on the lower leaf surface of red alder as seen along the Springwater Trail between Gresham and Boring, Oregon.......May 21, 2011.
Paul Slichter