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1 Tree was published in this study

A fossil-calibrated relaxed clock for Ephedra indicates an Oligocene age for the divergence of Asian and New World clades and Miocene dispersal into South America
Ickert-Bond, Rydin, Renner. (2009). JOURNAL OF SYSTEMATICS AND EVOLUTION.
Ephedra saxatilis Ephedra gerardiana Ephedra rhytidosperma Ephedra pachyclada Ephedra somalensis Ephedra sarcocarpa Ephedra strobilacea Ephedra distachya Ephedra monosperma Ephedra lomatolepis Ephedra intermedia Ephedra sinica Ephedra minuta Ephedra likiangensis Ephedra rupestris Ephedra tweediana Ephedra chilensis Ephedra ochreata Ephedra frustillata Ephedra americana Ephedra nevadensis Ephedra torreyana Ephedra californica Ephedra trifurca Ephedra foliata Ephedra laristanica Ephedra fragilis Ephedra altissima Ephedra foeminea Ephedra aphylla Ephedra alata Ephedra milleri Gnetum ula Gnetum parvifolium Gnetum cuspidatum Gnetum gnemon Gnetum costatum Gnetum nodiflorum Gnetum urens Gnetum africanum Welwitschia mirabilis
0 40 80 120 167 Time (MYA)
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