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 tenerrima

HABIT Annual. Culms erect, or geniculately ascending; 20–40 cm long; 4–5 -noded. Culm-internodes retrorsely scabrous. Leaf-sheaths smooth, or papillose; glabrous on surface. Ligule an eciliate membrane; 1–3 mm long; lacerate; obtuse. Leaf-blades conduplicate; 1–5 cm long; 0.2–2 mm wide. Leaf-blade surface scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 4.5–14 cm long; 2.5–8 cm wide. Primary panicle branches spreading; 4–6 -nate; whorled at most nodes.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; 1.5–5 mm long; 2.5–7 length of fertile spikelet.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 0.6–0.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 2.7–5.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume lanceolate; 0.6–0.7 mm long; 1.4–1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex obtuse.

FLORETS Fertile lemma elliptic; 0.4–0.5 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins obscure; extending close to apex. Lemma apex erose; truncate; muticous. Palea 0.1 mm long; 0.2 length of lemma; hyaline.

FLOWER Lodicules 2; membranous. Anthers 3; 0.3–0.4 mm long.

FRUIT Caryopsis with adherent pericarp; 0.5–0.6 mm long. Hilum linear.

DISTRIBUTION Europe: southwestern. Africa: north. South America: Mesoamericana.

NOTES Aveneae. Gr Extremad 1993.

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