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.

Koeleria vallesiana

HABIT Perennial; caespitose. Butt sheaths scarious; not bulbous, or thickened and forming a bulb; persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 10–40 cm long; 1–3 -noded. Leaves mostly basal. Ligule an eciliate membrane; 0.3–0.7 mm long. Leaf-blades filiform, or linear; flat, or convolute; 3–12 cm long; 1–3 mm wide; stiff. Leaf-blade surface ribbed; glabrous, or pubescent.

INFLORESCENCE Inflorescence a panicle. Peduncle pubescent above.

Panicle spiciform; linear, or lanceolate; continuous, or interrupted; 2–5.5(–7.5) cm long; 0.6–1.2 cm wide. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong, or cuneate; laterally compressed; 4.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent.

GLUMES Glumes persistent; similar; reaching apex of florets, or shorter than spikelet; similar to fertile lemma in texture; shiny; gaping. Lower glume lanceolate; 3.5–5.5 mm long; 0.7–0.8 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface glabrous. Lower glume apex acute. Upper glume elliptic; 4–6.3 mm long; 1–1.1 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface glabrous. Upper glume apex acute; muticous, or mucronate, or awned; 1 -awned. Upper glume awn 0–0.4 mm long.

FLORETS Fertile lemma elliptic; 4–5.3(–5.7) mm long; membranous; much thinner on margins; shiny; keeled; keeled above; 3 -veined. Lemma surface puberulous. Lemma apex acute; muticous, or mucronate. Palea gaping. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; oblong; membranous; 2-toothed. Anthers 3; (1.7–)2–2.5(–2.7) mm long. Ovary glabrous.

DISTRIBUTION Europe: northern, central, southwestern, and southeastern. Africa: north.

NOTES Aveneae. TAC.

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