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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 neglecta

HABIT Annual; caespitose; clumped loosely. Culms erect, or geniculately ascending; 10–30 cm long. Leaf-sheaths loose; keeled; glabrous on surface, or pilose. Ligule a ciliolate membrane; 1.2 mm long. Leaf-blades 8–10 cm long; 1.5–3 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; with tubercle-based hairs. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; unilateral; 1.5–7 cm long. Rhachis angular; 0.3–0.5 mm wide; glabrous on margins. Spikelet packing regular; 2 -rowed.

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

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 pubescent; base obtuse.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume linear; 1 length of spikelet; coriaceous; 1-keeled. Lower glume apex acute. Upper glume lanceolate; 1 length of spikelet; coriaceous; with hyaline margins; 1-keeled; winged on keel; winged above. Upper glume surface asperulous. Upper glume margins ciliate. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 1.5–2 mm long; hyaline; 0 -veined; without midvein; without lateral veins; ciliolate on margins; fringed above. Fertile lemma elliptic; 3–3.5 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 8–12 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.

FLOWER Anthers 2; 0.5–0.7 mm long.

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

DISTRIBUTION Asia-temperate: Soviet far east.

NOTES Andropogoneae. Tsvelev 1994.

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