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Gnetophyta

Gnetophyta A remarkable and probably artificial division of gymnosperms that comprises only the Gnetales. There are 3 constituent genera, embracing trees, shrubs, and lianes (Ephedra and Gnetum), and even turnip-like plants (Wel-witschia). Possible fossil material of the group is known from the early Permian, and there is also some fossil pollen from the Tertiary. With such a scant record it is not surprising that the evolutionary relationships of Gnetales remain unclear.

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"Gnetophyta." A Dictionary of Plant Sciences. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"Gnetophyta." A Dictionary of Plant Sciences. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/gnetophyta

Gnetophyta

Gnetophyta See gymnosperm.

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"Gnetophyta." A Dictionary of Biology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"Gnetophyta." A Dictionary of Biology. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/gnetophyta-0