Agrostis tandilensis

HABIT Annual; caespitose. Culms erect; 5–40 cm long. Ligule an eciliate membrane; 2 mm long. Leaf-blades 2–3 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 4–7 cm long; 0.5–0.9 cm wide.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 3–3.5 mm long; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3–3.5 mm long; 2 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 1.5 mm long; hyaline; without keel; 5 -veined. Lemma surface pubescent. Lemma apex dentate; 4 -fid; truncate; awned; 3 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 5–5.5 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes (outer lobes); 1–1.5 mm long. Palea absent or minute.

FLOWER Lodicules 2; membranous. Anthers 1 (plus 2 rudiments); 0.3–0.4 mm long.

FRUIT Caryopsis with adherent pericarp; 1.3 mm long; dark brown. Hilum linear.

DISTRIBUTION North America: southwest USA. South America: Brazil and southern South America.

NOTES Aveneae. Fl Entre Rios 1995.

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