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CCDB → Gymnosperms → Ephedraceae → Ephedra → Ephedra americana Humb. & Bonpl. ex Willd.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Ephedra americana Humb. & Bonpl. ex Willd. | Ephedra americana Humb. & Bonpl. ex Willd. | 28 | IPCN online | Chouhdry, A. S. 1984. Karyomorphological and cytological studies in Ephedra. J. Sci. Hiroshima Univ., Ser. B,. 19: 57–109. | |||
| Ephedra americana Humb. & Bonpl. ex Willd. | Ephedra americana Humb. & Bonpl. ex Willd. | 14 | IPCN online | Nakata, M. & K. Oginuma. 1989. Cytological studies on phanerogams in southern Peru, II. Chromosomes of Tetraglochin strictum (Rosaceae) and Ephedra americana (Ephedraceae). Bull. Natl. Sci. Mus., Tokyo, B 15: 63–66. | |||
| Ephedra americana Humb. & Bonpl. ex Willd. | Ephedra americana Humb. & Bonpl. ex Willd. | 28 | IPCN online | Leitch, I. J., L. Hanson, M. Winfield, J. Parker & M. D. Bennett. 2001. Nuclear DNA C-values complete familial representation in gymnosperms. Ann. Bot. (Oxford) 88: 843–849. | |||
| ! | Ephedra americana Humb. & Bonpl. ex Willd. | Ephedra americana Humb. & Bonpl. ex Willd. | 14 | Darlington, 1955 | Resende 1937 | ||
| ! | Ephedra americana None | Ephedra americana Humb. & Bonpl. ex Willd. | 14 | Cave1956supp | Hunziker 1955 |