Agrostis virescens

HABIT Perennial; caespitose. Culms erect; 40–80 cm long; 2–3 -noded. Lateral branches lacking. Leaves basal and cauline. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 4–6 mm long. Leaf-blades 9–22 cm long; 2–4 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 17–20 cm long; 1 cm wide. Primary panicle branches ascending; rebranched below middle.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.9–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 2.9–3.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2.9–3.5 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 1.6–2 mm long; hyaline; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; geniculate; with twisted column. Palea absent or minute.

FLOWER Lodicules 2; 0.7 mm long; membranous. Anthers 3; 0.6–0.7 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: Mesoamericana and western South America.

NOTES Aveneae. Fl Meso-Am 2004.

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