Indocalamus petelotii

HABIT Perennial. Rhizomes elongated; leptomorph. Culms 200–300 cm long; woody. Culm-internodes terete; distally glabrous. Lateral branches suffrutescent. Leaves cauline. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath auricles falcate. Ligule absent. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.6–1 cm long. Leaf-blades deciduous at the ligule; lanceolate; 28–30 cm long; 35–49 mm wide. Leaf-blade venation with 14 secondary veins; with distinct cross veins. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; 15–20 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 5–40 mm long.

FERTILE SPIKELETS Spikelets comprising 6–7 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 25–30 mm long; 5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 3 mm long. Floret callus pilose. Floret callus hairs 0.8–1 mm long.

GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet. Lower glume ovate; 3 mm long; chartaceous; without keels. Lower glume apex acuminate. Upper glume ovate; 6 mm long; chartaceous; without keels; 3–5 -veined. Upper glume surface pubescent; hairy at apex. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 10 mm long; chartaceous; without keel; 7 -veined. Lemma surface glabrous. Lemma apex attenuate. Palea 9.5 mm long; chartaceous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3. Anthers 3. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Arundinarieae. Camus 2002.

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