Rhamnaceae

Deerbrush: Ceanothus integerrimus - Common around the southern base of Mt. Adams, but seen occasionally up to 3000' on the southeastern flanks.

Mahala Mat: Ceanothus prostratus - Currently limited to within one-half mile of the western edge of the Klickitat Canyon.

Buck Brush, Red-stem Ceanothus: Ceanothus sanguineus - Currently only seen on the southeastern flank of Mt. Adams up to about 4100'.

Snow Brush, Mt. Balm: Ceanothus velutinus var. velutinus - Common on the eastern and southern slopes of Mt. Adams up to near the treeline.

Cascara: Rhamnus purshiana - Currently only seen on open slopes on the south side of Mt. Adams, including Crofton Butte and the Aiken Lava Flow.