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Ephedraceae
Ephedra, Ephedraceae
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Gnetum
Gnetum gnemon, Gnetum, Gnetum montanum
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Welwitschia
Conservation of Welwitschia mirabilis, Welwitschia mirabilis, Welwitschia mirabilis, Welwitschia mirabilis, West of Brandberg
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Gnetophyta
http://www.science.siu.edu/landplants/Gnetophyta/gnetophyta.html
A few images of each family.
Gnetophyta: An Enigmatic Group of Seed Plants
http://www.biology.ualberta.ca/courses.hp/bot511/
Slide show introduction to the group.
Phylum Gnetophyta (Vessel Bearing Gymnosperms)
http://botit.botany.wisc.edu/courses/systematics/Phyla/Gnetophyta/Gnetophyta.html
Characteristics of the group, with representative images.