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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 fauriei

HABIT Perennial; caespitose; clumped loosely. Cataphylls evident. Rhizomes short. Culms geniculately ascending; 20–60 cm long; 0.8–1.7 mm diam.; 2–3 -noded. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2–4 mm long. Leaf-blades 10–20 cm long; 2–4 mm wide; pruinose. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

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

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1(–2) fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.25–0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; recurved at apex. Lower glume lanceolate; 5–7 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5–7 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 4.5–6.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface punctate. Lemma apex dentate; 4 -fid; awned; 5 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; geniculate; 15–20 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 1–4 mm long. Apical sterile florets 1 in number; rudimentary. Apical sterile lemmas awned; 1 -awned. Apical sterile lemma awns 5–7 mm long.

FLOWER Lodicules 2. Anthers 3; 2.2–2.5 mm long. Stigmas 2.

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

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Aveneae. Koyama 1994.

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