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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 colorata

HABIT Perennial; caespitose; clumped densely. Culms erect; 15–30 cm long; 1–4 -noded. Culm-internodes antrorsely scabrous. Leaf-sheaths antrorsely scabrous; glabrous on surface. Ligule a ciliolate membrane; 0.5–0.8 mm long; acuminate. Leaf-blades filiform; convolute; 8–25 cm long; 0.5 mm wide; stiff. Leaf-blade surface scaberulous; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 5–10 cm long. Primary panicle branches spreading; whorled at most nodes.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 1–1.5 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 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 obtuse. Upper glume lanceolate; 4–4.5 mm long; 1.3 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 obtuse.

FLORETS Fertile lemma lanceolate; 3–3.5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; acuminate; mucronate, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; straight; 0.5 mm long overall. Palea 1 length of lemma. Rhachilla extension 1 mm long; 0.66 length of fertile floret; pilose.

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

FRUIT Caryopsis with adherent pericarp; lanceolate; 2 mm long. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION South America: western South America and southern South America.

NOTES Aveneae. Turpe 1995.

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