Himalayacalamus collaris (T. P. Yi) Ohrnb.

This species was collected on the border with Nepal. The ridged and grooved culms distinguish it from Himalayacalamus falconeri, while the absence of oral setae distinguishes it from H. porcatus Stapleton from further east in Nepal.

The culms are used for weaving.

Rhizome neck 3–4.5 cm, 1.3–3 cm in diam., internodes 2–6 mm, initially densely white-gray ciliolate. Culms 2–6 m, 1–3.5 cm in diam., hollow; internodes terete, 17–28 cm; longitudinal ridges prominent, initially glaucous and densely white powdery, especially in apical ring; wall 2–3 mm thick; nodes prominent; sheath scar prominent, with persistent remains of sheath base. Branches many. Culm sheaths yellow-brown when dry, rectangular, leathery, glabrous, distal margins densely yellow ciliolate, apex asymmetrical; auricles and oral setae absent; ligule truncate or inclined, ca. 1 mm, not ciliolate; blade reflexed, linear-lanceolate, white-gray setose. Leaves 3 or 4 per ultimate branch; sheath glabrous; auricles and oral setae absent; ligule usually purple, arcuate, ca. 1 mm, glabrous; blade lanceolate, 2–12.5 × 0.3–1.9 cm, abaxially slightly scabrous, secondary veins 3- or 4-paired, transverse veins undeveloped, base rounded or broadly cuneate, margins spinescent-serrulate. Inflorescence unknown. New shootsApr–May.

S Xizang (Zhangmu) [Nepal].

Temperate forests; 2200–3000 m.

Fargesia collaris T. P. Yi, J. Bamboo Res. 2(2): 21. 1983; Thamnocalamus collaris (T. P. Yi) T. P. Yi.