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 .

Gnetum gnemon is a gymnosperm species of Gnetum, its native area spans from Mizoram and Assam in India down south through Malay Peninsula, Malay Archipelago and the Philippines in southeast Asia to the western Pacific islands. [3]

Gnetum seeds (Fig. 13.26) are oval to elongated in shape and green to red in colour. It remains surrounded by a three-layered envelope which encloses the embryo and the endosperm. Outer envelope is fleshy, and consists of parenchymatous cells.

Oct 8, 2024 · Gnetum, Ephedra, and Welwitschia are three distinct genera within the Gnetales, each displaying unique characteristics and adaptations that reflect their respective environments. Understanding these differences can enhance comprehension of plant diversity and evolutionary biology. Gnetum:

Gnetum africanum is found mainly in the humid tropical forest regions of Central African Republic, Cameroon, Gabon, Republic of the Congo, Democratic Republic of the Congo and Angola. It has been found in primary and secondary semi-deciduous humid forests, both in dense and sunny transitional savannah locations, ranging from sea-level to 1200 ...

Gnetum is the only genus in the plant family Gnetaceae. They are gymnosperms: their seeds are naked, whereas the seeds of flowering plants are covered. [2] Plants in Gnetum are evergreen. Most of them are woody vines, but some are big enough to be trees. They grow in warmer, tropical regions of the world. [2] There are over 50 species living.

Gnetum (35 species) inhabits a variety of humid, tropical lowland, riparian, and swamp rainforests (> 1000 m above sea level) of South East Asia, Papua New Guinea, Fiji, the Americas (i.e., South America and as far north as Costa Rica), and Africa (Croat, 1970; Markgraf, 1951, 1965, 1972).

Feb 11, 2025 · Life Cycle of Gnetum. The life cycle of Gnetum shows an alternation of generations between the diploid sporophyte and haploid gametophyte. The independent Gnetum plant is a diploid sporophyte. It is monoecious that produces male and female cones on separate plants. The male plant bears the male cone that produces microsporangia.

Gnetum (Gnetales: Gnetaceae) constitutes an evolutionarily isolated gymnosperm clade, comprising about 40 species that inhabit tropical areas of the world. While its closest living relative, the monotypic Welwitschia, has a well–documented fossil record from the Early Cretaceous, Gnetum–like fossils are rare and poorly understood.

Gnetum is a genus of gymnosperms, the sole genus in the family Gnetaceae and order Gnetales. Gnetales Gnetales comprise three extant genera ( Ephedra , Gnetum , Welwitschia ) that are morphologically very distinct.