There are three very different orders, each with only one genus: Gnetales (Gnetum), Ephedrales (Ephedra or joint-firs), and Welwitschiales (Welwitschia).
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- 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)。