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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 multiculmis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 1000 cm long; 30 mm diam.; woody. Culm-internodes terete; hollow; 40–50 cm long; smooth; distally glabrous. Lateral branches dendroid. Culm-sheaths 26–28 cm long; 1 times as long as wide; pilose. Culm-sheath blade lanceolate; 4–6 cm long; 12–15 mm wide. Leaf-sheaths striately veined; glabrous on surface, or pilose. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; glaucous. Leaf-blade venation with distinct cross veins. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in untidy tufts; 3–4 cm long; glabrous on internodes; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between branches.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3 fertile florets; with diminished florets at the apex. Spikelets oblong; subterete; 12 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes suppressed between florets.

GLUMES Glumes several; 3–4 empty glumes; persistent; similar; shorter than spikelet; shiny. Lower glume ovate; 2 mm long. Lower glume surface glabrous. Lower glume apex acute. Upper glume ovate; 7 mm long. Upper glume surface glabrous. Upper glume apex acute.

FLORETS Fertile florets increasing in size upwards. Fertile lemma ovate; 9–12 mm long; chartaceous; shiny; without keel. Lemma surface glabrous. Lemma apex obtuse; mucronate. Palea 7–8 mm long; 2-keeled. Palea keels ciliate. Apical sterile florets 1 in number; barren; lanceolate.

FLOWER Lodicules absent. Anthers 6; 6 mm long; yellow; anther tip apiculate and penicillate. Filaments united in a tube. Stigmas 1. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Camus 2002.

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