Gnetum

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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 ?
In tropical Africa, The /russula-lactarius and /tomentella--thelephora lineages dominated ECM fungal flora on caesalpionioid legumes, Dipterocarpaceae, Sarcolaenaceae, Phyllantaceae, Asterpeiaceae, Sapotaceae, Papilionoideae, Gnetaceae and Proteaceae.
However, in Africa, most ECM described belongs to caesalpionioid legumes, Dipterocarpaceae, Sarcolaenaceae, Asterpeiaceae, Sapotaceae, Gnetaceae, and Proteaceae host (Ba et al., 2012).
(Gnetaceae) can reach heights of up to 30m above the ground, with stems of 15-20cm in DBH.
The plants used in this research are Megaphrynium macrostachyum (Marantaceae), Corchorus olitorus (Tiliaceae), Ricinodendron heudelotii (Euphorbiaceae), Gnetum bucholzianum (Gnetaceae), and Ipomoea batatas (Convolvulaceae).
Pollination biology of Gnetum (Gnetaceae) in a lowland mixed dipterocarp forest in Malaysia.
Oct 1907 (Gnetales).--Type: Gnetum L.; Gnetaceae Blume, 1833.
The same applies to ruminate storage tissues of gymnospermous seeds, as reported for Araucariaceae (Coulter & Chamberlain, 1910), Gnetaceae (Schnarf, 1933), Phyllocladaceae (Coulter & Chamberlain, 1910), Taxaceae (Oliver, 1902; Coulter & Land, 1905; Lotsy, 1911), and, less pronounced, Cupressaceae, Ephedraceae, and Cephalotaxaceae (Tamamshjan, 1951).