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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 clarionis

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 60–150 cm long. Lateral branches lacking. Ligule an eciliate membrane; 2–4 mm long; truncate, or obtuse. Leaf-blades 8–50 cm long; 1.8–10 mm wide. Leaf-blade surface scabrous; rough adaxially; glabrous; hairless except near base. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle open; lanceolate; continuous, or interrupted; dense, or loose; 8–18 cm long; 1–4 cm wide. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.2–0.25 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4–6 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 4–6 mm long; 1.5 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 4–4.5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1–0.25 way up back of lemma; geniculate; 4–9 mm long overall; with twisted column. Palea hyaline; 2 -veined. Rhachilla extension pilose.

FLOWER Lodicules 2. Anthers 3; 2.4–2.7 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Europe: northern, central, southwestern, southeastern, and eastern. Asia-temperate: Siberia, Soviet far east, Caucasus, western Asia, China, and eastern Asia. Asia-tropical: India, Malesia, and Papuasia.

NOTES Aveneae. Fl Pak 1993.

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