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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 fulgida

HABIT Perennial; caespitose; clumped densely. Culms slender; 40–50 cm long; 0.7–1 mm diam. Culm-internodes striate. Leaf-sheaths longer than adjacent culm internode; striately veined; glabrous on surface. Ligule an eciliate membrane; 3–5 mm long; truncate. Leaf-blades involute; 1–1.5 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; scabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 13 cm long; 1 cm wide. Primary panicle branches appressed; bearing spikelets almost to the base. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus sparsely hairy. Floret callus hairs 0.1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 1 length of upper glume; membranous; much thinner on margins; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.5–5.5 mm long; 1.3 length of adjacent fertile lemma; membranous; with membranous margins; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume surface glabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.5–4 mm long; membranous; without keel; 3 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 3 mm long overall. Palea 3.5–4 mm long. Rhachilla extension 1 mm long; sparsely hairy; hairy below.

FLOWER Lodicules 2. Anthers 3; 1.3 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Disseminule comprising a floret.

DISTRIBUTION South America: western South America.

NOTES Aveneae. Laegaard 2001.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.