Trees in this family include the American green alder and the mountain alder. Riparian areas support mountain alder, stream dogwood, willows, and sedges. Mountain alder, stream dogwood, willows, and sedges grow along streams. Riparian areas support mountain alder, stream dogwood, willows, and quaking aspen. Riparian areas support mountain alder, stinking and prickly currant, thimbleberry, and Columbia monk's hood.