After Earle, 2002
<==o Ephedra Linnaeus 1753 ()? [37] |-- E. arenarius |-- E. altissima |-- E. americana |-- E. andina |-- E. breana |-- E. ciliata |-- E. helvetica |-- E. rupestris |-- E. antisyphilitica Berlandier ex Meyer 1846 |-- E. aspera Engelmann ex Watson 1883 |-- E. californica Watson 1879 |-- E. coryi Reed 1936 |-- E. cutleri Peebles 1940 |-- E. distachya Linnaeus |-- E. equisetina Bunge 1851 |-- E. fasciculata Nelson 1934 |-- E. fedtschenkoae Pauls. 1905 |-- E. fragilis Desf. |-- E. frustillata Miers 1863 |-- E. funerea Coville & Morton 1935 |-- E. gerardiana Wall. ex C.A. Mey. 1846 |-- E. intermedia Schrenk ex C.A. Mey. 1846 |-- E. lepidosperma C.Y. Cheng 1975 |-- E. likiangensis Florin 1933 |-- E. macedonica Kos. |-- E. major Host. |-- E. minuta Florin 1927 |-- E. monosperma C.A. Mey. 1846 |-- E. nevadensis Watson 1879 |-- E. pedunculata Engelmann ex Watson 1883 |-- E. przewalskii Stapf 1889 |-- E. regeliana Florin 1933 |-- E. saxatilis Royle ex Florin 1933 |-- E. sinica Stapf 1927 |-- E. torreyana Watson 1879 |-- E. trifurca Torrey ex Watson 1871 `-- E. viridis Coville 1893
Reference(s):
- Earle, C. J., 2002-: Ephedraceae.
–iNet: The Gymnosperm Database: http://www.conifers.org