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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 leonardii

HABIT Perennial; culms solitary. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms geniculately ascending; 60–100 cm long. Culm-nodes brown. Leaves cauline. Leaf-sheaths smooth; pubescent; with reflexed hairs. Ligule an eciliate membrane; 3–4 mm long; erose. Leaf-blades 6–20 cm long; 2–5 mm wide. Leaf-blade surface scabrous; glabrous, or pilose; sparsely hairy; hairy adaxially. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; nodding; 12–20 cm long; 2–4 cm wide. Primary panicle branches ascending; 2–5 cm long; bearing spikelets almost to the base. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2 mm long; 0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; much thinner on margins; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 4.5 mm long; 1.1 length of adjacent fertile lemma; membranous; with hyaline margins; purple; 1-keeled; 1 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4–4.2 mm long; membranous; much thinner above; much thinner on margins; without keel; 5 -veined. Lemma surface scabrous. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.6 way up back of lemma; flexuous; 6 mm long overall; clearly exserted from spikelet. Rhachilla extension 1.5 mm long; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION South America: Caribbean.

NOTES Aveneae. N Amer Fl 1994.

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