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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 truncata

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; zigzag; 20 mm diam.; woody. Culm-internodes terete; with small lumen, or solid; 15–20 cm long; purple; retrorsely scabrous; distally pruinose. Lateral branches dendroid. Branch complement several; with 1 branch dominant; as thick as stem. Culm-sheaths deciduous but leaving a persistent girdle (this rugose); 8.5–10 cm long; pubescent; with appressed hairs; with tawny hairs; truncate at apex; without auricles; setose on shoulders. Culm-sheath ligule 1.5 mm high; entire. Culm-sheath blade narrowly ovate; constricted at base; reflexed; 6–7 cm long; 15–20 mm wide; glabrous on surface; acuminate. Leaf-sheaths glabrous on surface. Leaf-sheath auricles absent. Ligule an eciliate membrane; 1 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 12–20 cm long; 15–33 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in compact unilateral clumps; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between branches.

Fertile spikelets sessile.

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

GLUMES Glumes one the lower absent or obscure; persistent; shorter than spikelet. Upper glume ovate; 1.5 mm long. Upper glume apex acute; mucronate.

FLORETS Fertile lemma oblong; 1.5–2 mm long; coriaceous; without keel. Lemma surface glabrous. Lemma apex acute; mucronate. Palea involute; 1.5–2 mm long; coriaceous; without keels. Palea apex acute.

FLOWER Lodicules 3; 0.5 mm long; membranous; ciliate. Anthers 6; 1.5 mm long; yellow. Stigmas 3.

FRUIT Caryopsis with fleshy pericarp. Endosperm evanescent.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Widjaja 2002.

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