| Holodiscus argenteus var. matudai F.A. Ley, 1943 |
| Holodiscus australis A. Heller, 1898 |
| Holodiscus discolor (Pursh) Maxim., 1879 |
| Holodiscus dumosus (Nutt. ex Torr. & A. Gray) A. Heller, 1898 |
| Holodiscus fissus (Lindl.) C.K. Schneid., 1905 |
| Holodiscus loeseneri Dammer, 1919 |
| Holodiscus microphyllus Rydb., 1904 |
| Holodiscus orizabae F.A. Ley, 1943 |
| Holodiscus pachydiscus (Rydb.) Standl., 1929 |
| Horkelia Cham. & Schltdl., 1827 |
| Horkelia argyrocoma Rydb., 1898 |
| Horkelia bolanderi A. Gray, 1868 |
| Horkelia bolanderi subsp. clevelandii (Greene) D.D. Keck, 1939 |
| Horkelia clevelandii (Greene) Rydb., 1898 |
| Horkelia cuneata Lindl., 1837 |
| Horkelia truncata Rydb., 1908 |
| Ivesia Torr. & A. Gray, 1858 |
| Ivesia argyrocoma (Rydb.) Rydb., 1908 |
| Ivesia argyrocoma var. moranii Ertter & Reveal, 2007 |
| Ivesia saxosa (Greene) Ertter, 1989 |