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 spicigera

HABIT Perennial. Stolons present. Culms 12–50 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1.5–2 mm long. Leaf-blades curved, or flexuous; involute; 3–9 cm long; 2–3 mm wide. Leaf-blade surface puberulous; hairy adaxially. Leaf-blade margins pubescent.

INFLORESCENCE Inflorescence a panicle; subtended by an inflated leaf-sheath.

Panicle spiciform; linear; 2–6 cm long; 0.8–1.5 cm wide. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels glabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6–6.6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.7–1.5 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 ciliolate. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6–6.6 mm long; 1.2–1.3 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein ciliolate. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5–5.2 mm long; membranous; without keel. Lemma apex truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 4–5 mm long overall; with twisted column. Rhachilla extension 2–2.3 mm long; villous; with 3.2–4.3 mm long hairs.

FLOWER Lodicules 2. Anthers 3. 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. Tovar 1995.

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