Agrostis trisetoides

HABIT Annual. Culms geniculately ascending, or decumbent; 7–40 cm long. Ligule an eciliate membrane; 2.5–4 mm long; truncate. Leaf-blades 2–8 cm long; 1–2 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; oblong; interrupted; 2–7 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 4 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; 4 mm long; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 4 mm long; 1.3 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 3 mm long; hyaline; without keel; 5 -veined. Lemma surface pilose; hairy below. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 6–7 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 0.5 mm long. Palea absent or minute.

FLOWER Lodicules 2; membranous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. WDC 2001.

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