Figure 1.

Three extant genera and phylogenetic relationships of the Gnetales. (a) Ephedra minuta Florin photographed at Chayu, Xizang (Tibet), China. (b) Gnetum parvifolium (Warb.) C.Y. Cheng ex Chun photographed at Fairy Lake Botanic Garden, Shenzhen, Guangdong Province, China. (c) Welwitschia mirabilis Hook. f. photographed at Dahlem Botanic Garden, Berlin, Germany. (d) Simplified phylogenetic trees of the Gnetales within seed plants (after [14]). Left: Gnetales are placed at the base of an anthophyte clade in the morphology tree. Right: Gnetales are embedded within conifers forming a gnetifer clade in the molecular tree.

Yang et al. BMC Evolutionary Biology 2013 13:72   doi:10.1186/1471-2148-13-72
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