Gnetum


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

Gnetum

 

the only genus of the Gnetaceae family. There are about 40 species, distributed in humid tropical forests, particularly in South and Southeast Asia but also in South America and western tropical Africa. They are chiefly lianas, but some, such as G. gnemon, are small trees or bushes. The leaves are opposite, broad, integral, leathery, penninervate, with typical network veining. The plants are diclinous. Both the micro- and megastrobiles are gathered into whorls. The female gametophyte lacks archegonia, and egg cells are formed from free nuclei in the upper part of the gametophyte. When the seed ripens, the internal cover of the megastrobile forms a hard, rocklike layer, and the brightly colored surface becomes fleshy.

In tropical Asia several Gnetum species, for example, G.gnemon, are cultivated for their edible seeds. Young leaves and the strobiles are also used as food. G. ula provides edible oil.

REFERENCE

Takhtadzhian, A. L. Vysshie rasteniia, vol. 1. Moscow-Leningrad, 1956.

A. L. TAKHTADZHIAN

References in periodicals archive ?
The transverse wall of an axial parenchyma strand in wood of Gnetum gnemon is shown in Fig.
Tani et al., "Resveratrol derivativerich melinjo (Gnetum gnemon L.) seed extract suppresses multiple angiogenesis-related endothelial cell functions and tumor angiogenesis," Molecular Nutrition and Food Research, vol.
Harvesting and marketing of Gnetum species (Engl) in Cameroon and Nigeria.
Gnetum and the angiosperms: molecular evidence that their shared morphological characters are convergent, rather than homologous.
(stem) Gnetaceae: Gnetum nodiflorum Brongniart (stem) Guttiferae: Garcinia madruno (Kunth) Hammel (bark), Vismia amazonica Ewan (stem), Vismia macrophylla Kunth (stem) Hippocrataceae: Hippocratea volubilis L.
In your article on Welwitschia mirabilis, you state that "botanists have classified it with conifers." On the contrary, botanists classify it in the phylum Gnetophyta, along with Gnetum and Ephedra, rather than in the phylum Coniferophyta.
Class 4 Gnetopsida [Ephedra (Joint Fir), Gnetum, Welwitschia]
Extant seed plants comprise five clades [ILLUSTRATION FOR FIGURE 1 OMITTED]: cycads, Ginkgo, conifers, angiosperms, and Gnetales (Ephedra, Welwitschia, Gnetum).
Serve hot garnished with prawn (for variation 1) or cold garnished with fermented oil bean seed (Pentaclethra macrophylla) and garden egg leaves or ukazi leaves (Gnetum africanum) (for variation 3).
The goal is to conserve biodiversity and strengthen rural women livelihoods and the activities of the project involve production of forest vegetables at homestead, Gnetum africanum (Afang) and Talinum triangulare (Waterleaf) using organic manure , mulching for soil water conservation, Integrated Pest Management (IPM) and metal spiked stakes which are environmental friendly and sustainable.
In this respect, Ephedra is similar to other gnetophytes (Welwitschia and Gnetum) (Endress, 1996).