Bambusa vinhphuensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 1500 cm long; 90 mm diam.; woody; without nodal roots. Culm-internodes terete; hollow; mid-green. Lateral branches dendroid. Branch complement several; in a clump. Culm-sheaths deciduous; 21 cm long; 1 times as long as wide; coriaceous; yellow; pubescent; hairy below; auriculate; setose on shoulders. Culm-sheath ligule ciliolate. Leaf-sheath oral hairs setose. Leaf-sheath auricles falcate. Ligule a ciliolate membrane; 1 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.15 cm long. Leaf-blades deciduous at the ligule; lanceolate; 5.5–14 cm long; 10–15 mm wide. Leaf-blade venation with 8–12 secondary veins; without cross veins. Leaf-blade surface glabrous, or pubescent; hairy abaxially. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in untidy tufts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters.

FERTILE SPIKELETS Spikelets comprising 2–5 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 30–70 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; glabrous. Floret callus glabrous.

GLUMES Glumes two, or several; 2–3 empty glumes; persistent; similar. Upper glume lanceolate; 6–9 mm long; 11–13 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 11–12 mm long; without keel; 17–19 -veined. Lemma apex acute. Palea oblong; 1 length of lemma; 12 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; membranous. Anthers 6. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Nguyen 2002.

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