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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 decipiens
HABIT Perennial; caespitose; clumped loosely. Culms erect; 45–100 cm long; 3–4 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 2–4 mm long; scaberulous on abaxial surface; lacerate; truncate, or obtuse. Leaf-blades filiform, or linear; convolute; 10–30 cm long; 3–4 mm wide. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; nodding; 12–30 cm long. Primary panicle branches 2–8 -nate. Panicle axis with lower internodes 5–6 cm long. Panicle branches capillary; scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–2 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2–3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent, or pilose. Floret callus hairs 0.4–1 mm long.
GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 0.9–1 length of upper glume; membranous; much thinner on margins; mid-green, or purple; 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; 2–3 mm long; 1 length of adjacent fertile lemma; membranous; with scarious margins; mid-green, or purple; 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; 2–3 mm long; membranous; without keel; 5 -veined. Lemma lateral veins distinct. Lemma surface asperulous. Lemma apex truncate; awned; 1 -awned. Principal lemma awn subapical; 0.5–1 mm long overall. Palea 0.9 length of lemma; hyaline. Palea keels scaberulous; adorned above. Palea apex undifferentiated, or ciliate.
FLOWER Lodicules 2. Anthers 3; 0.7 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; lanceolate, or oblong. Hilum punctiform. Disseminule comprising a floret.
DISTRIBUTION Australasia: Australia.
NOTES Aveneae. Vickery 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
