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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Bambusa nutans

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 600–1200 cm long; 40–70 mm diam.; woody; with aerial roots from the nodes. Culm-internodes terete; with small lumen; 35–45 cm long; mid-green. Culm-nodes glabrous, or pubescent. Lateral branches dendroid. Culm-sheaths 15–23 cm long; pubescent; with appressed hairs; with black hairs; truncate at apex; auriculate; setose on shoulders. Culm-sheath ligule 2.5–5 mm high; dentate. Culm-sheath blade triangular; 15–23 cm long; pubescent; acute. Leaves cauline. Leaf-sheaths striately veined; pubescent. Leaf-sheath oral hairs setose. Leaf-sheath auricles falcate. Ligule an eciliate membrane; obtuse. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.3–0.5 cm long. Leaf-blades lanceolate; 15–30 cm long; 25–35 mm wide; glandular. Leaf-blade midrib conspicuous. Leaf-blade venation with 14–20 secondary veins. Leaf-blade surface glabrous, or puberulous; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate; antrorsely scabrous.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in untidy tufts; with spathaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets lanceolate; subterete; 17–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; clavate; pilose; hairy at tip.

GLUMES Glumes several; 2–3 empty glumes.

FLORETS Fertile lemma ovate; 10 mm long; without keel. Lemma inner surface pubescent. Lemma apex acute; mucronate. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; membranous; veined; ciliate. Anthers 6–7; anther tip apiculate. Stigmas 2–3; sparsely hairy. Ovary umbonate; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; oblong; hairy at apex.

DISTRIBUTION Asia-tropical: India and Indo-China.

NOTES Bambuseae. Gamble 1995.

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