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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 nudiflora

HABIT Perennial; caespitose; clumped loosely. Culms geniculately ascending; slender; 40–70 cm long; 6 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaf-sheaths striately veined; scaberulous. Ligule an eciliate membrane; 2–3 mm long; glabrous on abaxial surface; truncate. Leaf-blades flat, or involute; 4–10 cm long; 1–2 mm wide. Leaf-blade surface ribbed; scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; lanceolate; 5–10 cm long; bearing few spikelets. Primary panicle branches 1–2 -nate; sparsely divided. Panicle axis with lower internodes 1–2.5 cm long. Panicle branches with occasional prickles.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.2–1.5 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet, or reaching 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 obtuse, or acute. Upper glume lanceolate; 3–3.5 mm long; 0.95–1 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 truncate, or obtuse.

FLORETS Fertile lemma lanceolate; 3–3.5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex entire, or erose; truncate; muticous. Palea 1 length of lemma. Palea keels scaberulous; adorned above.

FLOWER Lodicules 2. Anthers 3; 1.5–2 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.