| Guaiacum parvifolium Planch. ex A. Gray, 1852 |
| Guaiacum planchonii A. Gray, 1887 |
| Guaiacum sanctum L., 1753 |
| Guaiacum unijugum Brandegee, 1915 |
| Guaiacum verticale Ortega, 1798 |
| Kallstroemia Scop., 1777 |
| Kallstroemia brachystylis Vail, 1897 |
| Kallstroemia californica (S. Watson) Vail, 1895 |
| Kallstroemia californica var. brachystylis (Vail) Kearney & Peebles, 1939 |
| Kallstroemia caribaea Rydb., 1910 |
| Kallstroemia cistoides (L.) Endl., 1836 |
| Kallstroemia curta Rydb., 1913 |
| Kallstroemia grandiflora Torr. ex A. Gray, 1852 |
| Kallstroemia hintonii D.M. Porter, 1969 |
| Kallstroemia hirsutissima Vail, 1903 |
| Kallstroemia incana Rydb., 1924 |
| Kallstroemia intermedia Rydb., 1910 |
| Kallstroemia longipes Rydb., 1910 |
| Kallstroemia maxima (L.) Hook. & Arn., 1838 |
| Kallstroemia mexicana Hook. & Arn. |