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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 agasthyamalayana

HABIT Annual; caespitose. Culms slender; 20–40 cm long. Culm-nodes glabrous. Leaves mostly basal. Leaf-sheaths 6–11 cm long; keeled; glabrous on surface. Ligule a ciliolate membrane; 1.25 mm long; truncate, or obtuse. Leaf-blades linear, or lanceolate; 9–18 cm long; 3–5 mm wide. Leaf-blade midrib keeled beneath. Leaf-blade surface glabrous; hairless throughout, or except near base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–3; paired, or digitate; unilateral; 5–9 cm long. Rhachis narrowly winged; angular; 0.75 mm wide; scaberulous on margins. Spikelet packing crowded; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels cuneate; flattened; 0.5–1 mm long; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; compressed strongly; 4–5 mm long; falling entire. Spikelet callus 0.3–0.4 mm long; pubescent; base obtuse.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; 1-keeled; winged on keel; winged narrowly; winged near apex. Lower glume primary vein scabrous. Lower glume surface glabrous. Lower glume apex acute. Upper glume elliptic, or oblong; 1 length of spikelet; coriaceous; 1-keeled; winged on keel; winged all along. Upper glume margins scabrous. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 2.5–3 mm long; hyaline; 1 -veined; without lateral veins; ciliolate on margins. Fertile lemma elliptic; 3–3.5 mm long; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; straight; 2.5–8 mm long overall; with twisted column. Palea absent or minute.

FLOWER Lodicules 2. Anthers 2; 1–1.5 mm long.

FRUIT Caryopsis with adherent pericarp; oblong; 2–2.5 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Raj & Ravi 2006.

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