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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 kostermansiana

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms zigzag; 15–20 mm diam.; woody. Culm-internodes terete; with small lumen; 22–28 cm long; smooth; distally pubescent. Lateral branches dendroid. Branch complement several; with 1 branch dominant; as thick as stem. Culm-sheaths deciduous but leaving a persistent girdle; 15 cm long; smooth; glabrous; auriculate; setose on shoulders; shoulders with 12 mm long hairs. Culm-sheath ligule lacerate. Culm-sheath blade narrowly ovate; reflexed; 9 cm long; 15 mm wide; glabrous on surface. Leaf-sheaths glabrous on surface, or pubescent. Leaf-sheath oral hairs setose. Leaf-sheath auricles erect. Ligule an eciliate membrane; lacerate. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 11–24 cm long; 15–40 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; glabrous on internodes, or pubescent on internodes; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between branches; 60 cm long overall.

Fertile spikelets sessile.

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

GLUMES Glumes several; 3–4 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. Lemma apex truncate. Palea involute; coriaceous; without keels.

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

FRUIT Caryopsis with fleshy pericarp; orbicular; isodiametric; 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.