GrassBase - The Online World Grass Flora


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

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

Deyeuxia boliviensis

HABIT Perennial; mat forming. Culms erect; 10–30 cm long. Culm-internodes smooth. Leaf-sheaths smooth; glabrous on surface, or puberulous. Ligule a ciliolate membrane; 0.8–1.4 mm long; truncate. Leaf-blades flat, or conduplicate, or convolute; 2–10 cm long; 1.6 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous, or puberulous; hairy on both sides. Leaf-blade margins ciliate. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; oblong; 4–9 cm long; 0.5–1 cm wide. Primary panicle branches 0.5 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.4–1.6 mm long; scabrous; glabrous, or puberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.4–0.8 mm long; 0.1–0.15 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4–5.4 mm long; 1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface scabrous; rough above. Lower glume apex acuminate. Upper glume lanceolate; 3.8–5.2 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface scabrous; rough above. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 2.8–3.6 mm long; membranous; pallid, or mid-green; without keel; 5 -veined. Lemma surface scabrous; rough above and on veins. Lemma apex dentate; 3–4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.33 way up back of lemma; geniculate; 4–5.8 mm long overall; clearly exserted from spikelet; with twisted column. Palea 1.6–2 mm long. Rhachilla extension 1–1.2 mm long; pilose; with 1–1.4 mm long hairs.

FLOWER Lodicules 2. Anthers 3; oblong; 0.4–0.5 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION South America: western South America.

NOTES Aveneae. Villav 1996.

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