GrassBase - The Online World Grass Flora


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

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

Dinebra retroflexa

HABIT Annual; caespitose. Culms 15–112 cm long. Leaf-sheaths glandular. Ligule an eciliate membrane, or a ciliolate membrane; 1.2–1.6 mm long; lacerate. Leaf-blades 4.5–28 cm long; 4–8 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes numerous; borne along a central axis; deflexed, or spreading; linear, or oblong, or cuneate; unilateral; 0.6–5 cm long; bearing few fertile spikelets, or many spikelets; bearing 2–20 fertile spikelets on each; simple. Central inflorescence axis 8–34 cm long. Rhachis deciduous from axis; narrowly winged; flattened. Spikelet packing broadside to rhachis.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1–3 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 5.7–9 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; recurved at apex. Lower glume elliptic; 6.1–8.2 mm long; 0.9–1 length of upper glume; coriaceous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex caudate. Upper glume elliptic; 6.1–8.2 mm long; 3 length of adjacent fertile lemma; coriaceous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex caudate.

FLORETS Fertile lemma ovate; 2.1–2.9 mm long; membranous; keeled; lightly keeled; 3 -veined. Lemma midvein pubescent; hairy below. Lemma lateral veins close to margins. Lemma margins pubescent; hairy below. Lemma apex emarginate, or acute; mucronate. Palea 0.8–0.9 length of lemma; 2 -veined. Palea keels pubescent. Apical sterile florets resembling fertile though underdeveloped.

FRUIT Caryopsis with adherent pericarp; ellipsoid; isodiametric; trigonous; 1 mm long.

DISTRIBUTION Africa: north, west tropical, west-central tropical, northeast tropical, east tropical, southern tropical, south, middle Atlantic ocean, and western Indian ocean. Asia-temperate: western Asia, Arabia, and China. Asia-tropical: India, Indo-China, and Malesia. Australasia: Australia.

NOTES Eragrostideae. FTEA.

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