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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 mackiei
HABIT Perennial; caespitose; clumped loosely. Culms erect; robust; 60–120 cm long; 3–5 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaves cauline. Leaf-sheaths striately veined; scaberulous. Ligule an eciliate membrane; 2–4 mm long; scaberulous on abaxial surface; truncate, or obtuse. Leaf-blades flat, or involute; 5–30 cm long; 2–6 mm wide. Leaf-blade surface ribbed; scabrous; rough on both sides. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; 20–40 cm long. Primary panicle branches 2–8 -nate; sparsely divided. Panicle axis with lower internodes 5–8 cm long. Panicle branches capillary; scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; 0.8–3 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent, or pilose. Floret callus hairs 0.2–1.4 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; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex obtuse. Upper glume lanceolate; 0.8 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 obtuse.
FLORETS Fertile lemma lanceolate; 3.5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex truncate; awned; 1 -awned. Principal lemma awn subapical; 0.5 mm long overall. Palea keels scaberulous; adorned above. Rhachilla extension 1.3 mm long; pilose; with 0.5–1 mm long hairs.
FLOWER Lodicules 2. Anthers 3; 1–1.4 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.
