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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Deyeuxia sinelatior

HABIT Perennial; caespitose. Culms erect; 130–150 cm long; 3–5 mm diam.; 3 -noded; with 0.4–0.5 of their length below uppermost node. Lateral branches lacking. Ligule an eciliate membrane; 4–20 mm long; lacerate. Leaf-blades 9–45 cm long; 4–8 mm wide. Leaf-blade surface scabrous; rough abaxially; puberulous; sparsely hairy; hairy adaxially.

INFLORESCENCE Inflorescence a panicle. Peduncle 27–30 cm long; scaberulous above.

Panicle open; ovate; 20–33 cm long; 6–15 cm wide. Primary panicle branches ascending, or spreading; whorled at most nodes; 9 cm long. Panicle axis with lower internodes 2.5–5.5 cm long; scaberulous; glabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 3 mm long; 0.75–0.9 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4–5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 4–5 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume lateral veins distinct. Upper glume apex obtuse.

FLORETS Fertile lemma oblong; 3.5–4 mm long; membranous; without keel; 5 -veined. Lemma apex emarginate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 5 mm long overall; with twisted column. Palea 0.8–0.9 length of lemma; 2 -veined. Palea apex dentate; 2 -fid. Rhachilla extension 1 mm long; villous; with 4 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 2 mm long; yellow. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Keng 1996.

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