| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Ephedraceae | Ephedra antisyphilitica | Tepopote, Popote, Cañatilla | Gravelly or rocky areas, arroyos, ravines. | OK south through ec. TX and w. TX to Mexico. |  |
| Ephedraceae | Ephedra pedunculata | Vine Jointfir, Comida de Víbora, Clapweed | Dry, sandy or rocky slopes. | C. TX south through s. TX to n. Mexico (AGS, CHH, COA, DGO, HGO, NLE, QRO, SLP, TAM, VER, ZAC). |  |