Deyeuxia macrophylla

HABIT Perennial. Rhizomes short. Culms decumbent; 50–130 cm long. Leaf-sheaths smooth, or antrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 3–5 mm long; acuminate. Leaf-blades involute; 20–45 cm long; 2–3 mm wide; stiff. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; interrupted; dense; 15–30 cm long; 2–3 cm wide. Primary panicle branches ascending. Panicle branches puberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels puberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6–7.8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.7–1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; light green, or purple; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6–7.8 mm long; 1.1–1.2 length of adjacent fertile lemma; membranous; light green, or purple; 1-keeled. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5.5–6.5 mm long; membranous; without keel. Lemma surface smooth, or scaberulous. Lemma apex dentate; 2–3 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.33 way up back of lemma; geniculate; 7–9 mm long overall; with twisted column. Rhachilla extension 2.7–3.5 mm long; pilose; with 1–2 mm long hairs.

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. Tovar 1995.

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