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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 appressa

HABIT Perennial; caespitose. Culms erect; 90 cm long; 5 -noded. Culm-internodes antrorsely scabrous. Culm-nodes glabrous. Leaf-sheaths pubescent. Ligule an eciliate membrane; 1–2 mm long; pubescent on abaxial surface; lacerate; truncate. Leaf-blades flat, or involute; 10–30 cm long; 2–4 mm wide. Leaf-blade surface ribbed; scabrous; rough abaxially; pubescent; densely hairy; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear, or lanceolate; interrupted; 20–30 cm long. Primary panicle branches appressed; 3–4 -nate. Panicle axis with lower internodes 3–6 cm long. Panicle branches 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; 4.5 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; reaching apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 1 length of adjacent fertile lemma; membranous; 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; 4.5 mm long; cartilaginous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 2–4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66–0.75 way up back of lemma; curved; 5 mm long overall; without a column. Palea keels scaberulous; adorned above. Palea apex ciliate.

FLOWER Lodicules 2. Anthers 3; 0.8 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.