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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 sublaevigata

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms zigzag; 20 mm diam.; woody. Culm-internodes terete; solid; 30–35 cm long; smooth; distally hispid. Lateral branches dendroid. Branch complement many; with 1 branch dominant; as thick as stem. Culm-sheaths 8–15 cm long; glabrous, or pubescent; hairy on margins; auriculate; with 3 mm high auricles; glabrous on shoulders. Culm-sheath ligule 1–2 mm high; entire. Culm-sheath blade ovate; reflexed; 8.5 cm long; 20–25 mm wide; glabrous on surface; attenuate. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 1 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 30–40 cm long; 45–65 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface smooth; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between branches; 200–300 cm long overall.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4 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; 5 -veined. Lower glume apex truncate. Upper glume oblate; 2 mm long; 7 -veined. Upper glume apex truncate.

FLORETS Fertile lemma orbicular; 3 mm long; coriaceous; without keel; 7 -veined. Lemma apex obtuse. Palea involute; 3.5 mm long; coriaceous; 8 -veined; without keels.

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

FRUIT Caryopsis with fleshy pericarp; orbicular; isodiametric; 9 mm long; rugose; 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.