Calamus nambariensis Becc.

Clustering moderate-sized to robust rattan. Stem climbing to 20 m or more, without sheaths 1–3 cm diam., with sheaths 1.5–6 cm diam., internodes 20–30 cm long. Leaf cirrate; sheaths dull green, variably armed with scattered, horizontal or slightly reflexed dull yellow green, green-based spines to 4 cm long, interspersed with much smaller broad-triangular dark green spines, spines sometimes absent, reddish brown caducous indumentum usually abundant on newly emerged sheaths; knee conspicuous, usually more sparsely armed than the rest of the sheath; ocrea very inconspicuous, unarmed, soon disintegrating; flagellum absent; petiole 8–20 cm long, armed with short green spines; rachis to 2.5 m or more; cirrus to 40–100 cm; leaflets c. 25 on each side of the rachis arranged in evenly spaced divergent pairs, a few leaflets near the base and the cirrus borne singly, the largest leaflets to 40–55 x 2.5–7 cm, tips somewhat cucullate, margins bristly, veins adaxially sometimes bristly, abaxially unarmed. Inflorescences male and female superficially similar, to 130 cm long, male to 140 cm long, lacking a terminal flagellum, the male branched to 3 orders, the female to 2 orders, partial inflorescences 6–8, rather close and not very well differentiated; male rachillae 3–4 x 0.2 cm, female rachillae 3–6 x 0.3 cm. Fruit rounded, the calyx tubular at fruit maturity so fruit appearing stalked, 25 x 20 mm, with a short rather triangular beak to 0.15 x 0.15 cm, and covered in 18 vertical rows of dull yellowish deeply channelled scales. Seed c. 1.8 x 1.5 cm, ± rounded; endosperm slightly ruminate. Seedling leaf not recorded.