Gnetales is an order of the gymnospermic seed plants. This order is composed of three genera- Gnetum, Ephedra, and Welwitschia. Chamberlain (1935) has placed all three genera in a single-family Gnetaceae. But Markgraf (1951) has been split up the order Gnetales (due to the heterogeneous characters of those three genera) into three families (e.g., Ephedraceae, […]
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