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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 cochinchinensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 500–600 cm long; 30–40 mm diam.; woody. Culm-internodes terete; hollow; 35 cm long. Lateral branches dendroid. Culm-sheaths 15 cm long; 1.5 times as long as wide; glabrous; truncate at apex. Culm-sheath blade lanceolate; 3.5 cm long; 10 mm wide. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule an eciliate membrane; truncate. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2–0.3 cm long. Leaf-blades lanceolate; 11–13 cm long; 15 mm wide; glaucous. Leaf-blade venation with 8–12 secondary veins; with distinct cross veins. Leaf-blade surface puberulous; hairy abaxially. Leaf-blade margins scabrous; ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in stellate clusters; 7–8 cm between clusters; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 22–23 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes suppressed between florets.

GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet. Lower glume 2.5 mm long. Upper glume ovate; 7.5 mm long. Upper glume margins ciliate (above). Upper glume apex acuminate; mucronate.

FLORETS Fertile florets increasing in size upwards. Fertile lemma ovate; 8–10 mm long; chartaceous; without keel; 15–19 -veined. Lemma margins ciliate; hairy above. Lemma hairs tawny, or purple. Lemma apex acute. Palea oblong; 2-keeled. Palea keels ciliate; adorned above. Apical sterile florets 1 in number; barren.

FLOWER Lodicules absent. Anthers 6; 6 mm long; anther tip with extended connective and pubescent. Filaments united in a tube. Stigmas 1. Ovary umbonate.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Lecomte 1996.

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