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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 oblonga

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms zigzag; 10–19 mm diam.; woody. Culm-internodes terete; solid; 17 cm long; smooth; distally pruinose, or glabrous. Lateral branches dendroid. Branch complement several; with 1 branch dominant; as thick as stem. Culm-sheaths 16–18 cm long; smooth; glabrous; auriculate; with 8–12 mm high auricles; with 2–3 mm wide auricles; setose on shoulders; shoulders with 10–12 mm long hairs. Culm-sheath ligule 1 mm high; entire, or ciliolate. Culm-sheath blade narrowly ovate; cordate; erect, or reflexed; 10–15 cm long; 10–18 mm wide; glabrous on surface; acuminate. Leaf-sheaths glabrous on surface, or pubescent. Leaf-sheath oral hairs ciliate; 5–7 mm long. Leaf-sheath auricles erect; 2 mm long. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 18–26 cm long; 25–55 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in oblong clusters; glabrous on internodes; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between branches; 30 cm long overall.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 2.5–3 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 2–3 empty glumes; persistent; shorter than spikelet. Lower glume oblate. Lower glume apex truncate. Upper glume oblate. Upper glume apex truncate.

FLORETS Fertile lemma oblong; 2 mm long; coriaceous; without keel; 7 -veined. Lemma apex acute. Palea involute; 2 mm long; coriaceous; 6 -veined; without keels.

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

FRUIT Caryopsis with fleshy pericarp; oblong; isodiametric; 12 mm long; smooth; glabrous. Endosperm evanescent.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Dransfield 1995.

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