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 hesperica

HABIT Perennial; caespitose; clumped loosely, or moderately. Rhizomes short. Stolons present. Basal innovations intravaginal. Culms erect, or geniculately ascending; 30–60 cm long; 3–4 -noded. Leaf-sheaths smooth. Ligule an eciliate membrane; 2.5–3 mm long; 1–2.2 mm long on basal shoots; acute. Leaf-blades conduplicate; 3.3–7 cm long; 1–3 mm wide. Leaf-blade surface scabrous; rough on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate, or pyramidal; 6–15 cm long; 2–5 cm wide. Primary panicle branches 5–6 -nate; whorled at lower nodes. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1 length of fertile spikelet; scabrous; tip widened.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or oblong; laterally compressed; 1.9–2.3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–0.3 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.9–2.3 mm long; 1.2–1.4 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.4–1.9 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface scaberulous. Lemma apex truncate, or acute; muticous, or awned (rarely); 1 -awned. Principal lemma awn dorsal; geniculate; 2 mm long overall; with twisted column. Palea oblong; 0.05–0.35 mm long; 0.04–0.2 length of lemma; hyaline; 2 -veined. Palea apex dentate; 2 -fid.

FLOWER Lodicules 2; lanceolate; 0.35–0.5 mm long; membranous. Anthers 3; 1–1.6 mm long. Stigmas 2; laterally exserted.

FRUIT Caryopsis with adherent pericarp; 1.2 mm long; apex unappendaged. Hilum linear. Endosperm farinose.

DISTRIBUTION Europe: southwestern.

NOTES Aveneae. Garcia 1996.

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