Agrostis hallii

HABIT Perennial. Rhizomes elongated. Culms 40–100 cm long. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 2–6 mm long; lacerate; acute. Leaf-blades 3–4 mm wide. Leaf-blade surface scaberulous; rough on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or ovate; 7–18 cm long. Primary panicle branches ascending, or spreading; whorled at most nodes.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3.2–4.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1–2 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 3.2–4.2 mm long; 1.1 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; 3–4 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; 3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins prominent; extending close to apex. Lemma apex entire, or dentate; 4 -fid; truncate; muticous. Palea absent or minute.

FLOWER Lodicules 2; 0.5 mm long; membranous. Anthers 3; 1.6–1.8 mm long; purple.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION North America: southwest USA.

NOTES Aveneae. Fl Pac NW 1994.

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