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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 sichuanensis

HABIT Perennial. Rhizomes elongated. Culms erect; 33–50 cm long; 2–3 mm diam.; 3–4 -noded. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 3–4 mm long; scarious; truncate. Leaf-blades 11–25 cm long; 4–5 mm wide. Leaf-blade surface scaberulous; rough abaxially; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 11–22 cm long; 1–2 cm wide. Primary panicle branches 3–4 -nate; naked below, or bearing spikelets almost to the base. Panicle branches flexuous; glabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2.5–2.8 mm long; 1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 3.5–4 mm long; 1.1 length of upper glume; membranous; light green, or purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface hirsute. Lower glume apex acute. Upper glume lanceolate; 3.2–3.8 mm long; 1.3 length of adjacent fertile lemma; membranous; light green, or purple; 1-keeled. Upper glume surface hirsute. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 2.5–2.8 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 1.2 mm long overall; not or scarcely exserted from spikelet. Palea 2 mm long. Rhachilla extension 1.8 mm long; pilose; with 1.8 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 1 mm long.

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

CLEISTOGENES AND VIVIPARY Cleistogenes present; in lower sheaths.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Yang 2003.

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