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Calamus kebariensis (Arecaceae or Palmae), a new species of rattan from the Bird's Head Peninsula in West Papua, Indonesia, is described and illustrated. This species, which, among the New Guinea Calamus species, most closely resembles C. cuthbertsonii and C. spanostachys, is distinguished by its short and extremely slender stems, finely pinnate leaves and short, erect inflorescences that are branched to one order only in pistillate specimens. Very slender, clustering rattan, erect, to 1.5 m. Stem with sheaths 3-5 mm diam., without sheaths 1.5-3.5 mm diam.; internodes 4-10.5 cm. Leaf ecirrate to 36 cm long including petiole; sheath green, with thin, patchy indumentum of brown, caducous scales, unarmed or very sparsely armed with minute spines along zone of adnation between inflorescence and sheath; knee 6.5-9 mm long, inconspicuous, unarmed; ocrea to 5 mm high, scarcely developed, tightly sheathing, densely armed with fine brown bristles, with brown indumentum similar to that of the sheath; flagellum absent in available material; petiole 4-10 cm, 1.5-2 mm wide and 1-2 mm thick at base, with scattered brown indumentum similar to that of the sheath, unarmed; rachis 9.5-16 cm, straight, with few, minute, reflexed spines on abaxial surface; leaflets 10-16 each side of rachis, regularly arranged, narrowly elliptic to linear, longest leaflets at mid-leaf position, mid-leaf leaflets 6.5-9 × 0.4-1 cm, apical leaflets 7-7.5 × 0.4-0.5 cm, apical leaflet pair not or scarcely united at base, with fine spines on margin and adaxial surface of major veins

Calamus kebariensis (Arecaceae)—a new montane rattan from New Guinea