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Gnetum
Gnetum gnemon
γ°γγΏγ
A gymnosperm growing in tropical forests of Southeast Asia. A unique gymnosperm with broad leaves resembling those of angiosperms and seeds covered by a fleshy sarcotesta. Seeds and young leaves are eaten in Southeast Asia. Rarely planted in Okinawa and Ogasawara in Japan.
Identification Points
- βLeaves are broadly elliptic and opposite, resembling angiosperm leaves (unusual for a gymnosperm)
- βStem nodes are swollen with distinct internodes
- βSeeds are enclosed in a fleshy sarcotesta, ripening red to orange
Habitat
Tropical forests of Southeast Asia (rarely cultivated in Japan)
Season
Year-round (evergreen)
Morphological TraitsAI-estimated, needs verification
Evergreen/Deciduous
Evergreen
Leaf arrangement
Opposite
Leaf shape
Round
Leaf type
Simple
Venation
Pinnate
Leaf margin
Entire
Petal fusion
No petals
Stipules
Absent
Ovary position
Superior
Plant sex
Dioecious
Phylogenetic Positionγ°γγγ η§ β
Phylogenetic Position
Gymnosperms > Gnetales > Gnetales > Gnetaceae
Divergence Era
Mesozoic Cretaceous (ca. 100 Ma onwards)
Evolution Notes
Gnetaceae represents an independent gymnosperm lineage (Gnetales), distinct from conifers, cycads, and angiosperms. It shares many features convergent with angiosperms, including broad leaves, reticulate venation, and vessel elements.
View on evolution timeline βSources & References
AI-generated, needs verification