Ampelocalamus naibunensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms leaning; drooping at the tip; 300–600 cm long; 5–10 mm diam.; woody. Culm-internodes terete; with small lumen; 12–18 cm long; smooth; distally glabrous. Culm-nodes swollen. Lateral branches fastigiate. Branch complement many; in a clump. Culm-sheaths deciduous; chartaceous; puberulous; truncate at apex; ciliate on shoulders. Culm-sheath blade linear; deciduous; glabrous on surface. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate; 3–6 mm long. Ligule a ciliolate membrane; obtuse. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.3–0.6 cm long. Leaf-blades deciduous at the ligule; linear, or lanceolate; 6–14 cm long; 5–12 mm wide. Leaf-blade venation with 4–6 secondary veins. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence comprising only a few spikelets; comprising 1–3 fertile spikelets; terminal and axillary; subtended by bracts (and clustered at nodes).

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1–6 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 20–40 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 3–5 mm long; chartaceous; without keels. Lower glume apex acute. Upper glume oblong; 3–5 mm long. Upper glume apex acute.

FLORETS Fertile lemma ovate; 10–12 mm long; 3–4 mm wide; chartaceous; without keel; 7–11 -veined. Lemma apex acute. Palea 7–11 mm long; 11 -veined. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; ciliate. Anthers 3; 4 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Arundinarieae. Lin. 2002.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.