Deyeuxia coarctata

HABIT Perennial. Rhizomes elongated. Culms erect; 80–150 cm long. Culm-internodes antrorsely scabrous. Leaf-sheaths antrorsely scabrous; glabrous on surface, or hirsute. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 2–4 mm long; truncate. Leaf-blades 5–10 mm wide; glaucous. Leaf-blade surface glabrous, or hirsute; sparsely hairy.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle contracted; linear; 8–20 cm long; 1–2 cm wide. Primary panicle branches 1–3 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.66 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex attenuate. Upper glume lanceolate; 6–7 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume surface scabrous. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; 5–6 mm long; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; straight; 1–2 mm long overall; not or scarcely exserted from spikelet. Rhachilla extension 1 mm long; pubescent.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION South America: western South America.

NOTES Aveneae. N Amer Fl 1994.

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