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Descriptions

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

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

Dinebra

HABIT Annual. Culms erect (1/1), or geniculately ascending (1/1); 15–65.83–120 cm long. Ligule an eciliate membrane (1), or a ciliolate membrane.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; spreading, or deflexed (2); linear, or oblong (1), or cuneate (1); unilateral; bearing few fertile spikelets (1), or many spikelets; bearing 2–20 fertile spikelets on each (1/1). Rhachis persistent (2), or deciduous from axis (1); wingless (2), or narrowly winged (1); flattened (1/2), or angular (1/2). Spikelet packing broadside to rhachis.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets (1), or 2 fertile florets, or 3 fertile florets (2), or 4 fertile florets (1); with diminished florets at the apex. Spikelets lanceolate (1), or cuneate (2); laterally compressed; 3.2–5.233–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite.

GLUMES Glumes persistent; exceeding apex of florets; firmer than fertile lemma; parallel to lemmas (2), or recurved at apex (1). Lower glume lanceolate (2), or elliptic (1); 0.9–0.9667–1 length of upper glume; membranous (1), or coriaceous (2); 1-keeled; 1 -veined, or 2–3 -veined (1). Lower glume lateral veins absent (2), or distinct (1). Lower glume surface without pits. Lower glume apex acute (1), or attenuate (1), or caudate (1). Upper glume lanceolate (2), or elliptic (1); 1.5–2.583–3 length of adjacent fertile lemma; membranous (1), or coriaceous (2); 1-keeled; 1 -veined (2), or 3 -veined (1). Upper glume apex acute (1), or attenuate (1), or caudate (1).

FLORETS Fertile lemma ovate; membranous; keeled; wingless; 3 -veined. Lemma midvein pubescent. Lemma surface unwrinkled; without grooves. Lemma margins pubescent. Lemma apex entire (2), or dentate (1); 2 -fid (1/1); emarginate (1/2), or obtuse (1/2), or acute (1/2); muticous (1), or mucronate (2). Palea 0.8–0.85–0.9 length of lemma; 2 -veined. Palea keels eciliate (1), or pubescent (2). Apical sterile florets resembling fertile though underdeveloped.

FRUIT Caryopsis with adherent pericarp; ellipsoid (2/2); isodiametric (2/2); trigonous (2/2).

DISTRIBUTION Africa, or Temperate Asia (1), or Tropical Asia (1), or Australasia (1).

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