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 chrysophylla

HABIT Perennial; mat forming. Culms erect, or geniculately ascending; 5–9 cm long. Culm-internodes smooth. Leaf-sheaths smooth. Ligule a ciliolate membrane; 0.6–1 mm long; glabrous on abaxial surface; truncate, or obtuse. Leaf-blades conduplicate; 1–2 cm long; 1.5–2 mm wide. Leaf-blade surface scabrous; rough abaxially. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; oblong; 1.5–3 cm long; 0.6–1 cm wide. Primary panicle branches appressed; 0.5–0.8 cm long. Panicle axis smooth. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.6–2 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.6–4.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.6–1.2 mm long; 0.2–0.25 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3.6–4.4 mm long; 1 length of upper glume; membranous; yellow, or mid-green, or purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3.6–4.4 mm long; membranous; yellow, or mid-green, or purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.4–4 mm long; membranous; yellow, or mid-green, or purple; without keel; 5 -veined. Lemma surface smooth, or scaberulous; rough above. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.4–0.5 way up back of lemma; straight, or curved; 3.4–4 mm long overall; not or scarcely exserted from spikelet. Palea 2–3.8 mm long. Rhachilla extension 1.6–2.4 mm long; villous; with 1.8–2.8 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.