There are three very different orders, each with only one genus: Gnetales (Gnetum), Ephedrales (Ephedra or joint-firs), and Welwitschiales (Welwitschia).
买麻藤分为三目，三目之间的差别极大，每目只含有一个属：买麻藤目（买麻藤属），麻黄目（麻黄属），百岁兰目（百岁兰属）。
Welwitschiales
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Welwitschiaceae
（重定向自Welwitschiales）
Welwitschiaceae is a family of plants of the order Gnetales with one living species, Welwitschia mirabilis, found in southwestern Africa. Three fossil species have been recovered from the Crato Formation – late Aptian (Lower Cretaceous) strata located in the Araripe Basin in northeastern Brazil.
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