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Descriptions

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

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

Gigantochloa compressa

HABIT Perennial; caespitose; clumped loosely. Rhizomes short; pachymorph. Culms erect; 1200–1800 cm long; 100 mm diam.; woody. Culm-internodes terete; hollow; 60 cm long; mid-green; distally pruinose. Lateral branches dendroid. Culm-sheaths persistent; 0.5 length of internode; hispid; with black hairs; auriculate. Culm-sheath ligule ciliate. Culm-sheath blade lanceolate; reflexed. Leaf-sheaths striately veined; pubescent. Ligule a ciliolate membrane; 1–2 mm long. Collar with external ligule; pubescent. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.3–0.5 cm long. Leaf-blades lanceolate; 20–45 cm long; 35–75 mm wide; glaucous. Leaf-blade venation with 14–28 secondary veins. Leaf-blade surface puberulous; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex filiform; antrorsely scabrous.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in stellate clusters; pubescent on internodes; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 20–25 mm long; 5–6 mm wide; breaking up at maturity; disarticulating above glumes but not between florets.

GLUMES Glumes several; 3–4 empty glumes; persistent; similar; shorter than spikelet. Upper glume ovate. Upper glume margins ciliate. Upper glume hairs black. Upper glume apex acute; mucronate.

FLORETS Fertile lemma ovate; 15–20 mm long; chartaceous; without keel. Lemma margins ciliate. Lemma hairs black. Lemma apex acuminate; mucronate. Palea 15–18 mm long; 7–8 -veined; 2-keeled. Palea keels ciliate. Apical sterile florets 1 in number; barren; lanceolate.

FLOWER Lodicules absent. Anthers 6–7; 9–13 mm long; anther tip with extended connective. Filaments united in a tube. Stigmas 1. Ovary umbonate; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Gr Burma 1997.

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