| Ceanothus andersonii Parry | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus californicus Kellogg | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus decumbens S.Watson | Ceanothus diversifolius Kellogg |
| Ceanothus divergens confusus (J.T.Howell) Abrams | Ceanothus confusus J.T.Howell |
| Ceanothus diversifolius foliosus (Parry) K.Brandegee | Ceanothus foliosus Parry |
| Ceanothus endlichii Loes. | Ceanothus fendleri A.Gray |
| Ceanothus fendleri viridis A.Gray ex Trel. | Ceanothus fendleri A.Gray |
| Ceanothus grandis Douglas ex Hook. | Ceanothus velutinus Douglas |
| Ceanothus hypericoides L'Hér. ex DC. | Ceanothus microphyllus Michx. |
| Ceanothus integerrimus californicus (Kellogg) G.T.Benson | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus integerrimus parvifolius S.Watson, Proc. Amer. Acad. Arts 10: 334 (1875) | Ceanothus parvifolius (S.Watson) Trel. |
| Ceanothus macrothyrsus Greene | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus mogollonicus Greene | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus myrianthus Greene | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus nevadensis Kellogg | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus peduncularis Greene | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus prostratus albiflorus J.T.Howell | Ceanothus prostratus Benth. |
| Ceanothus prostratus confusus (J.T.Howell) C.Schmidt | Ceanothus confusus J.T.Howell |
| Ceanothus prostratus grandiflorus (Torr.) Jeps. | Ceanothus gloriosus J.T.Howell |
| Ceanothus prostratus pumilus (Greene) C.L.Schmidt | Ceanothus pumilus Greene |
| Ceanothus puberulus Greene | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus rigidus fresnensis (Dudley ex Abrams) Jeps. | Ceanothus fresnensis Dudley ex Abrams |
| Ceanothus rigidus grandiforus Torr. | Ceanothus gloriosus J.T.Howell |
| Ceanothus subsericeus Rydb. | Ceanothus fendleri A.Gray |
| Ceanothus thyrsiflorus macrothyrsus Torr. | Ceanothus integerrimus Hook. & Arn. |
| Ceanothus utahensis Eastw. | Ceanothus martini M.E.Jones |
| Ceanothus verrucosus grandiflorus (Torr.) K.Brandegee | Ceanothus gloriosus J.T.Howell |