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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 himalaica

HABIT Perennial. Rhizomes elongated. Culms erect; 20–60 cm long; 2–3 mm diam.; 2(–4) -noded. Leaf-sheaths mostly shorter than adjacent culm internode; scaberulous; glabrous on surface. Ligule an eciliate membrane; 2–4 mm long. Leaf-blades 9–20 cm long; 2–5 mm wide. Leaf-blade surface scaberulous; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 6–17 cm long; 3–6 cm wide. Primary panicle branches ascending; 3.5–8 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising (1–)2 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–1.5 mm long; pilose; with 1–1.5 mm long hairs. Floret callus pilose. Floret callus hairs 1–1.5 mm long; 0.25 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acuminate. Upper glume lanceolate; 5–6.5 mm long; 1.25 length of adjacent fertile lemma; membranous; purple; 1-keeled. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 4 -fid; with lobes 0.2–0.8 mm long; awned; 1 -awned. Principal lemma awn dorsal; arising 0.6–0.8 way up back of lemma; curved; reflexed; 8–10 mm long overall. Palea keels scaberulous. Palea apex dentate; 2 -fid. Rhachilla extension 1 mm long; pilose; with 0.8–1 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 2–2.5 mm long.

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

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Liou 2003.

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