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Gnetum Cuspidatum
''Gnetum'' is a genus of gymnosperms, the sole genus in the family Gnetaceae within the Gnetophyta. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms, they possess vessel elements in the xylem. Some species have been proposed to have been the first plants to be insect-pollination, pollinated as their fossils occur in association with extinct pollinating scorpionflies.Ren D, Labandeira CC, Santiago-Blay JA, Rasnitsyn A, Shih CK, Bashkuev A, Logan MA, Hotton CL, Dilcher D. (2009). Probable Pollination Mode Before Angiosperms: Eurasian, Long-Proboscid Scorpionflies. Science, 326 (5954), 840-847. Molecular phylogenies based on nuclear and plastid sequences from most of the species indicate hybridization among some of the Southeast Asian species. Fossil-calibrated molecular-clocks suggest that the ''Gnetum'' lineages now found in Africa, South America and Southeast Asia are the result of ancient long-distance dispersal across seawater.Won H, Renner SS: The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnetum Macrostachyum
''Gnetum macrostachyum'' is a species of vine gymnosperm, native to tropical Asia. They are often harvested as a source of fiber. Description The Gnetum species is from the vine gymnosperm. Species number about 40 within this family. They feature decussate leaves, vessels in stems similar to angiosperms. They are overall dioecious pollen spreaders. ''G. Macrostachyum'' is an evergreen climbing plant that has twining stems. It is harvested for use as food and a source of fibre. This plant's phylum is gnetophyta within the class gnetopsida. This plant is widely distributed, and is protected in various countries and islands. It is mainly located in East Asia in places such as Thailand, Cambodia, Indonesia and even New Guinea. It usually grows in environments such as humid tropical rainforests, preferably by rivers on red or black soil, and usually at low elevations. Uses They produce red fruits, with seeds edible after roasting. The bark fibers are known for making rope ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |