Deyeuxia patagonica

HABIT Perennial. Rhizomes short. Culms erect; 45–80 cm long; 3–4 -noded. Leaf-sheaths scaberulous; glabrous on surface. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades 5–20 cm long; 3–5 mm wide. Leaf-blade surface scabrous; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; equilateral; 9–20 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.25 mm long. Floret callus bearded. Floret callus hairs 1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5–6 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.4 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4–4.5 mm long; membranous; without keel. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66–0.75 way up back of lemma; geniculate; 4–4.6 mm long overall; with twisted column. Palea 2.8–3.3 mm long. Palea keels scabrous. Rhachilla extension 2 mm long; pilose; hairy at tip.

FLOWER Lodicules 2; 0.5–0.6 mm long; glabrous. Anthers 3; 0.5–0.7 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; fusiform; 2.5–2.8 mm long. Hilum punctiform. Endosperm liquid. Disseminule comprising a floret.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Fl Pat 1995.

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