| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Zygophyllaceae | Guaiacum angustifolium | Guayacán, Soapbush, Ironwood, Texas Porliera | Thornscrub. | C. TX and w. TX south to Mexico (CHH, COA). |  |
| Zygophyllaceae | Guaiacum officinale | Common Lignumvitae | Hammocks. | Native of West Indies, Central America, and n. South America. |  |
| Zygophyllaceae | Guaiacum sanctum | Holywood Lignumvitae | Rockland hammocks. | S. FL; West Indies; c. and s. Mexico, Central America, and South America. |  |