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Descriptions

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

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

Dimeria copei

HABIT Annual; caespitose. Culms erect; slender; 50–75 cm long. Culm-nodes bearded. Lateral branches ample. Leaf-sheaths 5–10 cm long; keeled; glabrous on surface. Ligule a ciliolate membrane; 0.5–1 mm long. Leaf-blades 10–22 cm long; 1–2 mm wide. Leaf-blade midrib conspicuous; keeled beneath. Leaf-blade margins scaberulous; tuberculate-ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1–2(–3); single, or paired; unilateral; 5–10 cm long. Rhachis angular; 0.6–0.75 mm wide; glabrous on surface, or puberulous on surface; ciliate on margins. Spikelet packing crowded; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump; flattened; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; compressed strongly; 7.5–8 mm long; falling entire. Spikelet callus pubescent; base obtuse. Spikelet callus hairs 0.5–1 mm long.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume linear, or oblong; 5.5–5.75 mm long; 0.75 length of spikelet; coriaceous; 1-keeled; winged on keel; winged narrowly; winged above. Lower glume primary vein ciliate. Lower glume surface asperulous; rough at apex; pubescent. Lower glume apex setaceously attenuate. Upper glume elliptic, or oblong; 7–7.25 mm long; 1 length of spikelet; coriaceous; 1-keeled; winged on keel. Upper glume primary vein ciliate. Upper glume surface asperulous; rough at apex; pubescent. Upper glume margins ciliate. Upper glume apex setaceously attenuate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 3 mm long; hyaline; 1 -veined; with obscure midvein; without lateral veins; ciliate on margins; fringed above; acute. Fertile lemma oblong; 3.5–4 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 12–14 mm long overall; with twisted column. Column of lemma awn 3.5–4 mm long; glabrous. Palea lanceolate; 0.75 mm long; hyaline. Palea keels tuberculate (papillose above).

FLOWER Lodicules 2; cuneate; 0.25 mm long. Anthers 2; 1.25–2 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid, or oblong; 2.5–2.75 mm long; acute.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Ravi 2001.

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