Deyeuxia breviaristata

HABIT Perennial; caespitose. Culms erect; 6–25 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–4.5 mm long; pubescent on abaxial surface. Leaf-blades conduplicate, or involute; 2–6 cm long; 2–3 mm wide; stiff. Leaf-blade surface smooth, or scaberulous; rough abaxially; pubescent; hairy adaxially. Leaf-blade margins ciliate. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 2–4 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels glabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–1 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets, or 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 apex obtuse, or acute. Upper glume lanceolate; 3.5–4.7 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex obtuse, or acute.

FLORETS Fertile lemma lanceolate; 3.5–4 mm long; membranous; without keel. Lemma apex dentate; 3–4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 1–2 mm long overall. Rhachilla extension 1.5–2 mm long; pilose; with 2–2.5 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 and southern South America.

NOTES Aveneae. Tovar 1995.

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