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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Gigantochloa magentea
HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 800–1000 cm long; 50–60 mm diam.; woody. Culm-internodes terete; with small lumen; 35–40 cm long; mid-green. Culm-nodes glabrous, or pubescent. Lateral branches dendroid. Culm-sheaths deciduous; 12–13 cm long; hispid; with appressed hairs; with dark brown hairs; auriculate; with obtuse auricles; with 2 mm high auricles; setose on shoulders; shoulders with 3–4 mm long hairs. Culm-sheath ligule 1–2 mm high; entire. Culm-sheath blade lanceolate; narrower than sheath; reflexed; 2.5 cm long; 8 mm wide; glabrous on surface. Leaf-sheaths pilose; hairs dark brown; outer margin hairy. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate; 0.5 mm long; obtuse. Ligule an eciliate membrane; 0.5–1 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 15–25 cm long; 19–22 mm wide. Leaf-blade surface glabrous.
INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in stellate clusters, or untidy tufts; 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 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 10–15 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes suppressed between florets.
GLUMES Glumes one the lower absent or obscure; persistent; shorter than spikelet. Upper glume ovate; 4 mm long. Upper glume margins ciliate. Upper glume hairs dark brown. Upper glume apex acuminate; mucronate.
FLORETS Fertile florets increasing in size upwards. Fertile lemma ovate; 7–10 mm long; chartaceous; without keel. Lemma margins ciliate. Lemma hairs dark brown. Lemma apex acuminate. Palea 5–10 mm long; 2-keeled. Palea keels eciliate. Palea apex dentate; 2 -fid. Apical sterile florets 1 in number; barren (without palea); lanceolate.
FLOWER Lodicules absent. Anthers 6; 3 mm long; red. Filaments united in a tube. Stigmas 1; pubescent.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: Malesia.
NOTES Bambuseae. Widjaja 2002.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
