Agrostis humilis

HABIT Perennial; caespitose. Culms 5–10 cm long. Lateral branches lacking. Leaves mostly basal. Ligule an eciliate membrane; 0.5–1 mm long; erose; truncate, or obtuse. Leaf-blades filiform; flat, or conduplicate; 2–10 cm long; 0.5–1 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 1.5–2.5 cm long; 0.5 cm wide. Primary panicle branches appressed.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets elliptic; laterally compressed; 2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 2 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 acute. Upper glume lanceolate; 2 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 2 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; truncate; muticous. Palea 0.66–0.75 length of lemma; hyaline. Rhachilla extension 0–0.15 mm long.

FLOWER Lodicules 2; 0.3 mm long; membranous. Anthers 3; 0.6–0.7 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION North America: northwest USA and southwest USA.

NOTES Aveneae. Fl Pac NW 1994.

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