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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 connivens

HABIT Annual. Culms decumbent; 10–25 cm long. Culm-nodes bearded. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; 0.5–0.9 mm long. Leaf-blades linear, or lanceolate; 2.5 cm long; 2 mm wide. Leaf-blade surface scaberulous; rough on both sides; glabrous; hairless except near base. Leaf-blade margins tuberculate-ciliate. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; ascending; unilateral; 2–4 cm long. Rhachis narrowly winged; angular; 0.75 mm wide; ciliate 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 oblong; laterally compressed; compressed strongly; 3.5 mm long; falling entire. Spikelet callus bearded; base obtuse.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume linear; 3 mm long; 0.9 length of spikelet; coriaceous; much thinner on margins; 1-keeled; keeled above. Lower glume surface pubescent. Lower glume apex acuminate. Upper glume elliptic; 1 length of spikelet; coriaceous; with hyaline margins; 1-keeled; winged on keel; winged all along. Upper glume primary vein ciliate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 1.5–2 mm long; hyaline; ciliate 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 mm long overall; with twisted column. Column of lemma awn 3 mm long; glabrous. Palea absent or minute.

FLOWER Anthers 2; 0.6 mm long.

FRUIT Caryopsis linear; isodiametric; 2 mm long. Embryo 0.5 length of caryopsis.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Bor 1993.

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