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 ?
Harvesting and marketing of Gnetum species (Engl) in Cameroon and Nigeria.
Uber die Komchen-Schicht in den Pollensacken von Gnetum gnemon.
Gnetum africana and Telfaria occidentalis are vegetables usually consumed once or twice a day.
Pollination biology of Gnetum (Gnetaceae) in a lowland mixed dipterocarp forest in Malaysia.
Li JB, Lin M, Li SZ, Song WZ (1991) Studies on the structure of gnetifolin A of Gnetum parvifolium (Warb.
Gnetum and angiosperms: Molecular evidence that their shared morphological characters are convergent, rather than homologous.
Heterochrony and developmental innovation of female gametophyte ontogeny in Gnetum, a highly apomorphic seed plant.