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 glabra

HABIT Perennial; culms solitary. Rhizomes short, or elongated. Culms erect; 25–70 cm long; 2–4 -noded. Culm-nodes brown. Leaves cauline. Leaf-sheaths 2.5–20 cm long; smooth, or scaberulous. Ligule an eciliate membrane; 3–10 mm long; scaberulous on abaxial surface; erose. Leaf-blades 2.5–15 cm long; 1.5–5 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; nodding; 8–28 cm long. Primary panicle branches 2–5 -nate. Panicle axis 5–7 noded. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous; puberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.6–3.1 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.33–0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.6–3.1 mm long; 1.5–1.6 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 1.6–2 mm long; hyaline; without keel; 5 -veined. Lemma apex erose; truncate; muticous, or mucronate. Principal lemma awn dorsal. Palea absent or minute.

FLOWER Lodicules 2; 0.4–0.5 mm long; membranous. Anthers 3; 1.2–1.8 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Fl Pat 1995.

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