GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Agrostis perennis

HABIT Perennial; caespitose. Culms erect; 50–100 cm long; 4–5 -noded. Culm-nodes glabrous. Leaf-sheaths longer than adjacent culm internode; smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 5–10 mm long; entire, or lacerate; acute. Leaf-blades (5–)15–25 cm long; (2–)3–5 mm wide.

INFLORESCENCE Inflorescence a panicle; deciduous as a whole. Peduncle smooth; fracturing.

Panicle open; effuse; 15–35 cm long. Primary panicle branches appressed, or spreading (at maturity); whorled at most nodes.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; (2.3–)2.5–3(–3.5) mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; parallel to lemmas. Lower glume lanceolate; 2.3–3.5 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.3–3.5 mm long; 1.7–2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma oblong; 1.3–1.8 mm long; hyaline; without keel; 5 -veined. Lemma surface pubescent. Lemma apex dentate; 4 -fid; awned. Principal lemma awn dorsal; arising 0.5–0.75 way up back of lemma; geniculate; 3.5–6 mm long overall; with twisted column. Palea 0.9 length of lemma; hyaline; 2 -veined. Palea apex entire. Rhachilla extension 0.8–1.8 mm long; villous.

FLOWER Anthers 3; 0.5–0.6(–0.7) mm long.

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Fl Australia 2010.

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