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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 bialata

HABIT Annual. Culms slender; 10–45 cm long; 6 -noded. Culm-nodes bearded. Leaf-sheaths keeled; pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 0.5–1 mm long. Leaf-blades erect; 2.5–7 cm long; 2.5 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface scabrous; rough on both sides; pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins scabrous; tuberculate-ciliate. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; ascending (divergent); straight; unilateral; 2.5–3.5 cm long. Rhachis flattened; 1–1.25 mm wide; scabrous on margins; glabrous on margins. Spikelet packing crowded; regular; 2 -rowed.

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

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; compressed strongly; 3.5–4 mm long; falling entire. Spikelet callus 0.3 mm long; base obtuse.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3–3.25 mm long; 0.9 length of spikelet; coriaceous; much thinner on margins; 1-keeled; winged on keel; winged narrowly. Lower glume primary vein ciliate. Lower glume apex acute. Upper glume elliptic; 3.5 mm long; 1 length of spikelet; coriaceous; 1-keeled; winged on keel; winged all along. Upper glume primary vein ciliolate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; ciliolate on margins. Fertile lemma elliptic; 2.5 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 9–11 mm long overall; with twisted column. Column of lemma awn 2.5–4 mm long; glabrous. Palea absent or minute.

FLOWER Anthers 2; 1 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Bor 1993.

ADDITIONAL CHARACTERS Glume wing corky.

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