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 subchalybaea

HABIT Perennial; caespitose. Culms erect; 40–120 cm long; 2–3 -noded; with 0.5 of their length below uppermost node. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane. Leaf-blades 30–60 cm long; 3–8 mm wide; stiff; grey-green. Leaf-blade surface glabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate to oblong; 8–20 cm long. Primary panicle branches appressed.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5–0.66 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume elliptic; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume elliptic; 1.2–1.3 length of adjacent fertile lemma; membranous; 1-keeled; 1–3 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; 3.5–4 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.3–0.5 way up back of lemma; geniculate; 1–2 mm long overall; not or scarcely exserted from spikelet; with twisted column. Palea elliptic; 0.66–0.75 length of lemma; hyaline; 2 -veined. Rhachilla extension 0.2 length of fertile floret; pilose.

FLOWER Lodicules 2; lanceolate. Anthers 3. Stigmas 2.

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

DISTRIBUTION Asia-temperate: Caucasus.

NOTES Aveneae. Zlaki 1997.

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