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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 hasskarliana

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 500–600 cm long; 30–50 mm diam.; woody. Culm-internodes terete; hollow; mid-green; distally pubescent. Lateral branches dendroid. Buds or branches absent from lower quarter of culm. Culm-sheaths hairy on margins; auriculate. Culm-sheath ligule 2–4 mm high; ciliolate. Culm-sheath blade lanceolate; narrower than sheath; spreading, or reflexed; pubescent. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane; entire, or erose. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2–0.5 cm long. Leaf-blades lanceolate; 15–40 cm long; 20–45 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in stellate clusters; dense; 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 3–4 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 20–25 mm long; 4 mm wide; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes suppressed between florets.

GLUMES Glumes several; persistent; similar; shorter than spikelet.

FLORETS Fertile florets increasing in size upwards. Fertile lemma ovate; 20 mm long; chartaceous; without keel. Lemma margins ciliate. Lemma hairs dark brown. Lemma apex acute. Palea 10–12 -veined; 2-keeled. Palea keels ciliolate. Apical sterile florets 1 in number; barren; lanceolate.

FLOWER Lodicules absent. Anthers 6; 7 mm long; anther tip penicillate. Filaments united in a tube. Stigmas 1; pubescent. Ovary umbonate; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex.

DISTRIBUTION Asia-tropical: Indo-China and Malesia.

NOTES Bambuseae. Holttum 1995.

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