Calamus henryanus Becc.

Slender clustering rattan. Stems climbing to 10 m long, without sheaths to 0.4–1 cm diam., with sheaths to 2 cm diam., internodes 5–18 cm long. Leaves ecirrate; sheaths green with reddish brown indumentum, and bearing abundant scattered or partially grouped narrow triangular spines with swollen bases, the longest to 2 cm, the spine margins hairy, smaller spines often interspersed with larger ones, occasionally a few spines around the leaf sheath mouth larger than the rest, to 5 cm long and erect; ocrea inconspicuous, unarmed; knee conspicuous, generally unarmed; flagellum to 1 m; leaf rachis to 75 cm long, bearing up to 35 leaflets on each side, regularly arranged but usually with a few gaps; the longest 15–40 x 1.3–2 cm, covered with small bristles along the 3–5 prominent ribs adaxially and abaxially, margins bristly. Inflorescence with a terminal flagellum, and with up to 5 rather distant partial inflorescences; male and female inflorescences superficially similar, to 1.5 m long, the male branched to 2–3 orders, the female to 1–2 orders, each partial inflorescences to 12 cm long, composed of strongly adpressed rachillae 0.5–2.5 cm long, giving the whole partial infloresccnce a spike-like appearance. Mature fruit broad ellipsoid, c. 1 x 0.7 cm, with a short beak, and covered with c. 17 vertical rows of straw-coloured scales with dark red margins. Seed rounded, c. 0.7 cm diam.; endosperm homogeneous.