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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 koelerioides

HABIT Perennial; caespitose; clumped densely. Rhizomes absent, or short. Culms 40–80 cm long. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 1.5–3.5 mm long; pubescent on abaxial surface; erose, or lacerate; truncate, or obtuse. Collar glabrous. Leaf-blades flat, or involute; 2–4 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.

Panicle contracted; linear; 7–12 cm long; 1–1.5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.24–0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5–6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1–3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins distinct. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 5–6 mm long overall; not or scarcely exserted from spikelet; with twisted column. Palea 1 length of lemma. Rhachilla extension 1.2 mm long; 0.25 length of fertile floret; pilose; with 1 mm long hairs.

FLOWER Lodicules 2; 0.6 mm long. Anthers 3; 2.2–3.2 mm long. Stigmas 2.

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

DISTRIBUTION North America: northwest USA, southwest USA, and Mexico.

NOTES Aveneae. Fl Pac NW 1994.

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