Gnetum is a genus of about 30-35 species of gymnosperms, the sole genus in the family Gnetaceae and order Gnetales. They are tropical evergreen trees, shrubs and lianas. Gnetum montanum Markgraf, Vines to more than 10 m tall; branchlets orbicular or compressed orbicular in cross section, smooth, sometimes wrinkled longitudinally. Petiole 0.8-1.5 cm; leaf blade usually oblong,  leathery or nearly so, lateral veins 8-13 on each side, base rounded or broadly cuneate, apex obtuse to acute. Male inflorescences lax, once or twice branched, 2.5-6 cm; peduncle 6-12 mm; male spikes 2-3 cm * 2.5-3 mm, involucral collars 13-18, each collar with (20-)25-45 flowers plus 10-15 sterile female flowers, basal hairs forming a dense, short cushion. Female inflorescences lateral, solitary or fascicled, main axis thin, with 3 or 4 pairs of branches; peduncle 2-3 cm; female spikes 2-3 cm * ca. 4 mm, enlarging to ca. 10 cm when mature, nodes each with 5-8 female flowers, basal hairs sparse, short.