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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 tibetica

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect, or geniculately ascending; 10–20 cm long; 1 mm diam. Culm-internodes antrorsely scabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 2 mm long; scaberulous on abaxial surface; entire, or lacerate; obtuse. Leaf-blades 3–6 cm long; 2–3 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above; glabrous, or pubescent above.

Panicle spiciform; linear, or oblong, or ovate; 1–2 cm long; 0.75–1.25 cm wide. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 3 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 5 mm long; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface villous. Lower glume margins ciliate. Lower glume apex acute. Upper glume elliptic; 1.2 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume surface villous. Upper glume margins ciliolate. Upper glume apex acute.

FLORETS Fertile lemma oblong; 4 mm long; membranous; purple; without keel; 5 -veined. Lemma apex dentate; 4 -fid; truncate; awned; 3 -awned. Principal lemma awn dorsal; arising 0–0.1 way up back of lemma; geniculate; 5.5 mm long overall; with twisted column. Lateral lemma awns 0.5 mm long. Palea keels scaberulous. Rhachilla extension 3 mm long; pilose; with 4 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 2.25 mm long. Stigmas 2.

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

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Aveneae. Bor 1995.

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