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 rauhii

HABIT Perennial. Rhizomes elongated. Culms erect; 63 cm long. Leaf-sheaths smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 1–2 mm long; erose. Leaf-blades conduplicate, or involute; 15–25 cm long; 2–3 mm wide; coriaceous; stiff. Leaf-blade surface scabrous; rough abaxially; pubescent; densely hairy; hairy adaxially. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 18 cm long. Primary panicle branches ascending.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels puberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.5–6.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 5.5–6.2 mm long; 1.2 length of adjacent fertile lemma; membranous; purple; 1-keeled. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4.5–5 mm long; membranous; without keel. Lemma surface hispidulous. Lemma apex dentate; 3–4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.05 way up back of lemma; geniculate; 7–7.5 mm long overall; with twisted column. Rhachilla extension 1.7–2 mm long; pubescent; with 0.5–1 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.

NOTES Aveneae. Tovar 1995.

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