Vietnamosasa darlacensis

HABIT Perennial. Rhizomes elongated; leptomorph. Culms 100–150 cm long; 10 mm diam.; woody. Culm-internodes terete. Lateral branches dendroid. Culm-sheaths 22–25 cm long; 2 times as long as wide; coriaceous; convex at apex; auriculate; setose on shoulders; shoulders with 10–12 mm long hairs. Leaf-sheaths outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 1 mm long. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath; petiole 0.1 cm long. Leaf-blades linear, or lanceolate; 9–15 cm long; 4–5 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface pilose; hairy adaxially. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets linear, or oblong; laterally compressed; 20–40 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 1–2 mm long; chartaceous; without keels. Lower glume apex acute. Upper glume ovate; 1–2 mm long; chartaceous; without keels. Upper glume apex acute.

FLORETS Fertile lemma ovate; 8–9 mm long; chartaceous; without keel. Palea 8–9 mm long. Palea keels ciliate. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp; apex unappendaged.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Nguyen 1996.

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