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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 nepalensis

HABIT Perennial. Rhizomes short. Culms 30–60 cm long. Culm-internodes smooth; distally glabrous. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths striately veined; smooth; glabrous on surface. Ligule an eciliate membrane; 2.5 mm long; obtuse. Leaf-blades conduplicate; 15–25 cm long; 2–5 mm wide. Leaf-blade surface smooth, or scabrous; glabrous. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle; without bracts, or bracteate at branch bases.

Panicle open; ovate; 18 cm long; 13 cm wide. Primary panicle branches 3–7 -nate; 4–8 cm long. Panicle branches smooth; glabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets elliptic; laterally compressed; acuminate; 3.5–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume elliptic; 3.5–4.5 mm long; 1 length of upper glume; membranous; dark green and purple; 1-keeled; keeled above; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute, or acuminate. Upper glume elliptic; 3.5–4.5 mm long; 1.4–1.6 length of adjacent fertile lemma; membranous; dark green and purple; 1-keeled; keeled above; 3 -veined. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic, or oblong; 2.5–2.75 mm long; hyaline; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; straight; 6–7 mm long overall. Palea hyaline; 2 -veined. Palea keels smooth.

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

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

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

NOTES Aveneae. Bor 1996.

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