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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 orissae

HABIT Annual. Culms slender; 10–22 cm long. Culm-nodes glabrous. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades erect; 3–7 cm long; 2–3 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface scaberulous; rough on both sides; glabrous; hairless throughout, or except near base. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; erect; straight, or sinuous; unilateral; 3–5.5 cm long. Rhachis broadly winged; 1.25 mm wide; scabrous on margins; glabrous on margins. Spikelet packing crowded; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels cuneate; flattened; 0.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; 4–4.25 mm long; falling entire. Spikelet callus 0.25 mm long; bearded; base obtuse.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume linear; 3 mm long; 0.75 length of spikelet; coriaceous; much thinner on margins; 1-keeled. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume elliptic; 1 length of spikelet; coriaceous; with hyaline margins; 1-keeled; winged on keel; winged near apex. Upper glume primary vein scabrous. Upper glume surface scabrous; pilose; hairy at apex. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 2 mm long; hyaline; ciliate on margins. Fertile lemma elliptic; 2 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 10 mm long overall; with twisted column. Column of lemma awn 4 mm long; glabrous. Palea absent or minute.

FLOWER Anthers 2; 0.5 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Bor 1993.

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