[Alders East of the Cascade Mountains of Oregon and Washington]
Red Alder, Oregon Alder

Alnus rubra

Synonyms: Alnus oregona, Alnus oregona var. pinnatisecta, Alnus rubra var. pinnatisecta

Dorsal leaf surface of Red Alder, Oregon Alder: Alnus rubra (Synonyms: Alnus oregona, Alnus oregona var. pinnatisecta, Alnus rubra var. pinnatisecta --- Ventral leaf surface of Red Alder, Oregon Alder: Alnus rubra (Synonyms: Alnus oregona, Alnus oregona var. pinnatisecta, Alnus rubra var. pinnatisecta

The dorsal leaf surface (left) and ventral leaf surface (right)of red alder as seen on Wedge Mt., Wenatchee National Forest...................June 8, 2009. The leaf margins are doubly toothed (large teeth with smaller, coarse teeth) with the blade rolled downward at the margin (not easily seen in the photo at right).
Paul Slichter