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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 violacea
HABIT Perennial; mat forming. Culms erect; 6–25 cm long. Culm-internodes smooth. Leaf-sheaths smooth. Ligule an eciliate membrane, or a ciliolate membrane; 1.6–3.2 mm long; obtuse, or acute. Leaf-blades conduplicate; 1.5–13 cm long; 2–3 mm wide. Leaf-blade venation with subepidermal sclerenchyma attached to veins below. Leaf-blade surface scabrous; rough on both sides; glabrous, or puberulous. Leaf-blade margins scabrous. Leaf-blade apex acute, or acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; 2–5.5 cm long; 0.5–0.8 cm wide. Primary panicle branches 0.8–1 cm long. Panicle axis smooth, or scaberulous; with scattered hairs, or glabrous. Panicle branches pilose.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.8–4.2 mm long; smooth, or scaberulous; pubescent.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.5–6.8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.8–1.6 mm long; 0.25 length of lemma.
GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5.5–6.8 mm long; 1.1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or scabrous. Lower glume apex obtuse to acuminate. Upper glume lanceolate; 5–6.2 mm long; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface smooth, or scabrous. Upper glume apex obtuse to acuminate.
FLORETS Fertile lemma lanceolate; 3.8–5.8 mm long; membranous; purple; without keel; 5 -veined. Lemma surface scabrous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 5–8.8 mm long overall; clearly exserted from spikelet; with twisted column. Palea 3–4 mm long. Rhachilla extension 1.4–2.2 mm long; villous; with 2–2.4 mm long hairs.
FLOWER Lodicules 2. Anthers 3; linear; 1.6–2 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
DISTRIBUTION South America: western South America and southern South America.
NOTES Aveneae. Villav 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
