review of the alkaloid distribution in different species of the genus Ephedra see Jian-fang Cui (1991). Other American and European species of Ephedra, e.g. Ephedra nevadensis (Nevada Mormon tea) have not been systematically assayed; based on unpublished field investigations, they contain very low levels (less than 0.1%) or none at all. See also Haoma References External links Ephedra viridis (Plants for a Future Database) Usage in Chinese Medicine Ephedra fact sheet, NIH National Center for Complementary and Integrative Health Ephedrea (Evidence and dosing) , Mayo Clinic Ephedra – Clinical summary and mechanism of action, MSKCC Memorial Sloan Kettering Cancer Center Ephedraceae of Mongolia in FloraGREIF Gymnosperm genera Medicinal plants Soma (drink) Plants used in traditional Chinese medicine Aptian genus first appearances Extant Aptian first appearances