Mountain Whitethorn, Snow Bush: Ceanothus cordulatus -
Buck Brush: Ceanothus cuneatus var. cuneatus -
Deerbrush, Deer Brush: Ceanothus integerrimus (Synonyms: Ceanothus andersonii, Ceanothus californicus, Ceanothus integerrimus var. californicus, Ceanothus integerrimus var. macrothyrsus) -
Palmer Ceanothus: Ceanothus palmeri - Introduced, not naturalized in the Cascade-Siskiyou National Monument.
Mahala Mat, Prostrate Ceanothus: Ceanothus prostratus -
Siskiyou Mat: Ceanothus pumilus -
Oregon Tea Tree, Redstem Ceanothus: Ceanothus sanguineus -
Blue Blossum, Wild Lilac: Ceanothus thyrsiflorus -
Tobacco Brush: Ceanothus velutinus var. hookeri -
Tobacco Brush: Ceanothus velutinus var. laevigatus (Synonym: Ceanothus velutinus var. hookeri)
Greasewood, Mountain Balm, Snow Brush, Sticky Laurel, Tobacco Brush: Ceanothus velutinus var. velutinus (Synonym: Ceanothus velutinus ssp. velutinus) -