Agrostis arvensis

HABIT Perennial; culms solitary. Rhizomes elongated. Culms geniculately ascending; slender; 35–50 cm long; 2–3 -noded. Culm-internodes distally glabrous. Lateral branches lacking. Leaves cauline. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.4–1 mm long; erose; obtuse. Leaf-blades 4–8 cm long; 0.5–0.6 mm wide. Leaf-blade surface smooth.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 5–9 cm long; 0.3–0.5 cm wide. Primary panicle branches appressed. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–3 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.1–2.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.1–2.5 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 1.4–1.7 mm long; hyaline; without keel; 5 -veined. Lemma apex erose; truncate; muticous. Palea 0.5–0.6 mm long; 0.33 length of lemma; 0 -veined.

FLOWER Lodicules 2; 0.3 mm long; membranous. Anthers 3; 1.1–1.3 mm long.

FRUIT Caryopsis with adherent pericarp. Endosperm farinose.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Rugolo & Molina 2001.

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