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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Deyeuxia scaberula
HABIT Perennial; caespitose. Culms erect; slender; 60–90 cm long; 3–4 -noded. Culm-internodes antrorsely scabrous. Culm-nodes glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 2–3 mm long; pubescent on abaxial surface; lacerate; truncate. Leaf-blades 6–15 cm long; 1.5–4 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous, or pubescent; hairy on both sides. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; 12–25 cm long. Primary panicle branches 3–6 -nate. Panicle axis with lower internodes 4 cm long. Panicle branches capillary; scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–4 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–0.5 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 0.9 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 3.5 mm long; 1.1 length of adjacent fertile lemma; membranous; with scarious margins; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acute.
FLORETS Fertile lemma lanceolate; 3 mm long; membranous; light brown; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scaberulous. Lemma apex entire, or dentate; 2 -fid; obtuse; awned; 1 -awned. Principal lemma awn subapical; straight; 0.5–1 mm long overall; without a column. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Rhachilla extension 0.8 mm long; pubescent; with 0.2–0.5 mm long hairs.
FLOWER Lodicules 2. Anthers 3; 1.5 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
DISTRIBUTION Australasia: Australia. South America: western South America.
NOTES Aveneae. Vickery 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
