| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Polygalaceae | Hebecarpa macradenia | Tamaulipan scrub over limestone or caliche. | S TX west to s. AZ, south into n. Mexico. |  | |
| Polygalaceae | Hebecarpa ovatifolia | Oval-leaf Polygala | Scrub and woodlands on rocky slopes. | Ec., c. and s. TX, south into Mexico (CHH, COA, NLE, TAM). |  |
| Polygalaceae | Hebecarpa punctata | Glandular Milkwort | Thornscrub. | S. TX and adjacent Mexico (COA, NLE, SLP, TAM). |  |