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Descriptions

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

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

Deyeuxia carinata

HABIT Perennial; caespitose. Culms decumbent; 20–30 cm long; 3 -noded. Leaf-sheaths longer than adjacent culm internode; striately veined; scaberulous. Ligule a ciliolate membrane; 5–6 mm long; pubescent on abaxial surface; erose; truncate. Leaf-blades flat, or conduplicate; 5–8 cm long; 1–2 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade apex abruptly acute; callose.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 8 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–2 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–1.2 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 acuminate; mucronate. Upper glume lanceolate; 1 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 5–5.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scaberulous. Lemma apex dentate; 2 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.6 way up back of lemma; geniculate; 4 mm long overall; with twisted column. Palea 3.5 mm long. Palea keels scaberulous; adorned above. Rhachilla extension 0.5 mm long; glabrous.

FLOWER Lodicules 2. Anthers 3; 0.7 mm long; retained within floret. 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.