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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 acuminata
HABIT Perennial; caespitose; clumped loosely. Culms erect; robust; 100 cm long; 5 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaves cauline. Leaf-sheaths striately veined; scaberulous. Ligule an eciliate membrane; 4–8 mm long; pubescent on abaxial surface; lacerate; truncate. Leaf-blades 15–30 cm long; 2–5 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially; pubescent; hairy adaxially.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; 20–40 cm long. Primary panicle branches spreading; 3–6 -nate. Panicle axis with lower internodes 6–10 cm long. Panicle branches capillary; scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; 1–4 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose, or bearded. Floret callus hairs 0.7–2 mm long.
GLUMES Glumes persistent; similar; shorter than spikelet; firmer than fertile lemma; parallel to lemmas. Lower glume lanceolate; 0.9 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; 4 mm long; 0.75 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; 5–5.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scaberulous. Lemma apex truncate; awned; 1 -awned. Principal lemma awn subapical; 1–1.5 mm long overall. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Palea surface scaberulous. Rhachilla extension 0.5–1 mm long; pilose; with 1.5 mm long hairs.
FLOWER Lodicules 2. Anthers 3; 2–2.3 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. 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.
