| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|
| Polygalaceae | Rhinotropis lindheimeri var. lindheimeri | | Bluffs and hills over calcareous rocks. | S. Edwards Plateau and the s. Texas plains (barely entering the se. TX Coastal Plain), and n. Mexico (TAM, NLE, COA, and CHH). | |
| Polygalaceae | Rhinotropis lindheimeri var. parvifolia | | Oak-juniper woodlands, mesquite savanna, scrub. | Sw. OK, Panhandle TX, s. NM, and s. AZ south to sc. TX, west TX, south into Mexico (NLE, COA, CHH, ZAC). | |
| Polygalaceae | Rhinotropis nitida var. goliadensis | | Tamaulipan thornscrub. | S. TX. | |
| Polygalaceae | Rhinotropis nitida var. tamaulipana | | Thornscrub, coastal prairie, oak savanna. | Se. TX south to TAM and NLE. | |