Clades: Gnetopsida; Gnetophyta;
Gymnospermae;
Plants.
Habitat: dry regions; xeromorphic.
BotanyHerbs: photosynthetic.
Stem: vessels porose perforation plates.
Leaves: dioecious, shed early; scale-like, sheathed; narrow, striate.
Fruit: seed cones with 1 to 3 ovules; double fertilization.