GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Deyeuxia smithii

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 30–60 cm long. Ligule an eciliate membrane; 2–2.5 mm long; obtuse. Leaf-blades erect; 15–35 cm long; stiff. Leaf-blade surface smooth; glabrous. Leaf-blade apex acute; pungent.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth; glabrous.

Panicle open; oblong; 12 cm long; 3.5 cm wide. Primary panicle branches ascending; 3 -nate; 6.5 cm long; bearing 24 fertile spikelets on each lower branch. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose; obtuse; disarticulating obliquely. Floret callus hairs 0.5–0.75 mm long; 0.1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5.5 mm long; 1 length of upper glume; coriaceous; 1-keeled; 3 -veined. Lower glume apex acute, or acuminate. Upper glume lanceolate; 5.5 mm long; 1.2–1.5 length of adjacent fertile lemma; coriaceous; 1-keeled; 3 -veined. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma lanceolate; 3.75–4.25 mm long; chartaceous; without keel; 4 -veined. Lemma surface scaberulous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; straight, or flexuous; 2.25–3.5 mm long overall. Palea 3.5–4 mm long; 2 -veined. Palea keels scabrous. Rhachilla extension 0.25–1 mm long; pubescent; with 0.5 mm long hairs.

FLOWER Anthers 3; 2.5 mm long; purple.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Aveneae. Veldkamp 2005.

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