| Common Name | Scientific Name | Code |
| n/a | Ephedra ?arenicola Cutler [torreyana ? viridis] | EPAR |
| n/a | Ephedra ?intermixta Cutler [torreyana ? trifurca] | EPIN |
| n/a | Ephedra fragilis Desf. | EPFR2 |
| Arizona jointfir | Ephedra fasciculata A. Nels. | EPFA |
| California jointfir | Ephedra californica S. Wats. | EPCA2 |
| Chinese ephedra | Ephedra sinica Stapf | EPSI3 |
| clapweed | Ephedra antisyphilitica Berl. ex C.A. Mey. | EPAN |
| Cory's jointfir | Ephedra coryi E.L. Reed | EPCO2 |
| Cutler's jointfir | Ephedra cutleri Peebles | EPCU |
| Death Valley jointfir | Ephedra funerea Coville & Morton | EPFU |
| Ephedra antisyphilitica | Ephedra antisyphilitica Berl. ex C.A. Mey. var. brachycarpa Cory | EPANB2 |
| Ephedra aspera | Ephedra nevadensis S. Wats. var. aspera (Engelm. ex S. Wats.) L. Benson | EPNEA |
| Ephedra aspera | Ephedra reedii Cory | EPRE3 |
| Ephedra cutleri | Ephedra coryi E.L. Reed var. viscida Cutler | EPCOV |
| Ephedra cutleri | Ephedra viridis Coville var. viscida (Cutler) L. Benson | EPVIV2 |
| Ephedra fasciculata | Ephedra clokeyi Cutler | EPCL2 |
| Ephedra fasciculata | Ephedra fasciculata A. Nels. var. clokeyi (Cutler) Clokey | EPFAC |
| Ephedra fasciculata | Ephedra fasciculata A. Nelson var. fasciculata A. Nelson [superfluous autonym] | EPFAF2 |
| Ephedra funerea | Ephedra californica S. Wats. var. funerea (Coville & Morton) L. Benson | EPCAF |
| Gerard jointfir | Ephedra gerardiana Wallich ex Stapf | EPGE2 |
| high-climbing jointfir | Ephedra altissima Desf. | EPAL3 |
| jointfir | Ephedra distachya L. | EPDI2 |
| jointfir | Ephedra L. | EPHED |
| longleaf jointfir | Ephedra trifurca Torr. ex S. Wats. | EPTR |
| ma huang | Ephedra equisetina Bunge | EPEQ2 |
| mormon tea | Ephedra viridis Coville | EPVI |
| Nevada jointfir | Ephedra nevadensis S. Wats. | EPNE |
| rough jointfir | Ephedra aspera Engelm. ex S. Wats. | EPAS |
| Torrey's jointfir | Ephedra torreyana S. Wats. | EPTO |
| Torrey's jointfir | Ephedra torreyana S. Wats. var. powelliorum T. Wendt | EPTOP |
| Torrey's jointfir | Ephedra torreyana S. Wats. var. torreyana | EPTOT |
| vine jointfir | Ephedra pedunculata Engelm. ex S. Wats. | EPPE |