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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 autumnalis

HABIT Perennial; caespitose; clumped loosely. Rhizomes short. Culms geniculately ascending; 20–70 cm long; 0.7–1.2 mm diam.; 3–5 -noded. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface, or pilose. Leaf-sheath oral hairs ciliate. Leaf-sheath auricles erect. Ligule an eciliate membrane; 1–2 mm long. Leaf-blades 10–30 cm long; 3–10 mm wide; stiff; glaucous. Leaf-blade venation prominent. Leaf-blade surface smooth.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 5–15 cm long; 1–2 cm wide. Primary panicle branches 2–4 -nate; 2–3.5 cm long. Panicle branches smooth to scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3.5–5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 3.5–5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 3–4.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; straight; 3–4 mm long overall; without a column.

FLOWER Lodicules 2. Anthers 3; 1.8–2 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 2–2.2 mm long. 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.