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About how many species are included in the genus Gnetum?

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welwitschia — Gnetophyte Welwitschia, or tumboa (*Welwitschia mirabilis*), in Namibia.

The genus Gnetum includes 30 or more species. These plants are primarily found in tropical regions, where most varieties grow as woody vines or lianas, though some species, such as G. gnemon, grow as trees.123