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Descriptions

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

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

Dinochloa obclavata

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms zigzag; 7 mm diam.; woody. Culm-internodes terete; hollow; 20–30 cm long; smooth; distally glabrous. Lateral branches dendroid. Branch complement many; with 1 branch dominant; as thick as stem. Culm-sheaths 15–21 cm long; purple; smooth; glabrous; without auricles. Culm-sheath ligule 1 mm high; ciliate. Culm-sheath blade lanceolate; erect; 5–9 cm long; 5–10 mm wide; glabrous on surface; attenuate. Leaf-sheaths hispid; outer margin hairy. Leaf-sheath oral hairs setose. Leaf-sheath auricles erect; 1 mm long. Ligule a ciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 13–20 cm long; 12–19 mm wide. Leaf-blade surface scabrous; pubescent. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in untidy tufts; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between branches; 150 cm long overall.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 2–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes two; persistent; shorter than spikelet. Lower glume oblate; 1.5 mm long; 3 -veined. Lower glume apex truncate. Upper glume oblate; 2 mm long; 7 -veined. Upper glume apex cuspidate.

FLORETS Fertile lemma oblong; 2.5 mm long; coriaceous; without keel; 7 -veined. Lemma apex obtuse. Palea involute; 3.5 mm long; coriaceous; 6–8 -veined; without keels.

FLOWER Lodicules absent. Anthers 6; anther tip apiculate. Stigmas 3. Ovary umbonate; glabrous.

FRUIT Caryopsis with fleshy pericarp; ovoid; isodiametric; 15 mm long; pallid, or green; smooth; glabrous; acute. Endosperm evanescent.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Dransfield 1995.

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