GrassBase - The Online World Grass Flora


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

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

Deyeuxia flaccida

HABIT Perennial. Culms slender; 100 cm long; 1 mm diam.; 6 -noded; with 0.66 of their length below uppermost node. Culm-internodes smooth, or scaberulous. Lateral branches lacking. Leaf-sheaths 16 cm long; antrorsely scabrous. Ligule an eciliate membrane; 1–4 mm long; lacerate. Leaf-blades 5–17 cm long; 1–4 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 18 cm long; 14 cm wide. Primary panicle branches drooping; 2–5 -nate; 10 cm long. Panicle branches capillary; smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; 2–4 mm long; scabrous; tip widened.

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

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4 mm long; 1.1 length of upper glume; membranous; light green and purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3.5 mm long; 1 length of adjacent fertile lemma; membranous; light green and purple; 1-keeled; 3 -veined. Upper glume primary vein smooth. Upper glume lateral veins obscure. Upper glume apex obtuse.

FLORETS Fertile lemma oblong; 3.5 mm long; hyaline; without keel; 5 -veined. Lemma apex dentate; 2 -fid; obtuse; muticous. Palea 0.5 length of lemma; hyaline; 2 -veined. Rhachilla extension 0.8 mm long; villous; with 2.5 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 0.7 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; fusiform; 2 mm long; light brown. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Keng 1996.

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