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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 sivarajanii

HABIT Annual; caespitose. Culms erect; 20–40 cm long. Culm-nodes bearded. Lateral branches sparse. Leaf-sheaths 4–8 cm long; keeled; pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 1 mm long. Leaf-blades linear, or lanceolate; 15 cm long; 5 mm wide. Leaf-blade surface pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1–2; single, or paired; unilateral; 4–7 cm long. Rhachis narrowly winged; flattened; 1–1.5 mm wide; ciliate on margins. Spikelet packing crowded; regular; 2 -rowed.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels cuneate; flattened; 0.5–0.75 mm long; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; compressed strongly; 5.5–7.5 mm long; falling entire. Spikelet callus 0.5–1 mm long; bearded; base obtuse. Spikelet callus hairs 1–1.5 mm long.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic, or oblong; 1 length of spikelet; coriaceous; 1-keeled; winged on keel; winged all along. Lower glume surface asperulous. Lower glume margins ciliate. Lower glume apex acuminate; mucronate. Upper glume elliptic, or oblong; 1 length of spikelet; coriaceous; 1-keeled; winged on keel; winged all along. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 0.5 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 2.75 mm long; hyaline; 2 -veined; obscurely veined; ciliolate on margins. Fertile lemma elliptic; 3–4 mm long; without keel; 1 -veined. Lemma surface papillose. Lemma margins ciliate. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 14 mm long overall; with twisted column. Column of lemma awn 3–5 mm long. Palea absent or minute.

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

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

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Mohanan & Ravi 2006.

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