| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Ephedra | trifurca | 315 |
| 2 | Ephedra | nevadensis | 277 |
| 3 | Ephedra | viridis | 235 |
| 4 | Ephedra | californica | 139 |
| 5 | Ephedra | aspera | 131 |
| 6 | Ephedra | antisyphilitica | 95 |
| 7 | Ephedra | torreyana | 85 |
| 8 | Ephedra | fasciculata | 25 |
| 9 | Ephedra | foeminea | 24 |
| 10 | Ephedra | distachya | 19 |
| 11 | Ephedra | compacta | 11 |
| 12 | Ephedra | pedunculata | 10 |
| 13 | Ephedra | funerea | 8 |
| 14 | Ephedra | coryi | 8 |
| 15 | Ephedra | americana | 7 |
| 16 | Ephedra | fragilis | 6 |
| 17 | Ephedra | major | 4 |
| 18 | Ephedra | breana | 4 |
| 19 | Ephedra | gerardiana | 3 |
| 20 | Ephedra | chilensis | 3 |
| 21 | Ephedra | cutleri | 2 |
| 22 | Ephedra | triandra | 1 |
| 23 | Ephedra | intermedia | 1 |
| 24 | Ephedra | foliata | 1 |
| 25 | Ephedra | aphylla | 1 |