Indosasa sondongensis

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 400 cm long; 30 mm diam.; woody. Culm-internodes terete; hollow; 30–40 cm long. Lateral branches dendroid. Branch complement three. Leaf-sheaths outer margin hairy. Leaf-sheath oral hairs ciliate; 5–7 mm long. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath; petiole 0.4–0.5 cm long. Leaf-blades lanceolate, or oblong; 16–19 cm long; 20–30 mm wide. Leaf-blade venation with 10–14 secondary veins; with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; paniculate; lax; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 14–18 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 100 mm long; 5–6 mm wide; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 4 empty glumes; persistent; similar; shorter than spikelet. Lower glume lanceolate. Upper glume lanceolate; 5–7 mm long.

FLORETS Fertile lemma ovate; 10 mm long; coriaceous; without keel; 21–23 -veined. Lemma apex acute; awned. Palea 7 mm long. Palea surface pilose; hairy on margins. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; 4 mm long. Anthers 6. Stigmas 3.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 8 mm long; light brown.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Arundinarieae. Nguyen 2002.

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