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Descriptions

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

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

Arrhenatherum pallens

HABIT Perennial; caespitose. Culms 30–70 cm long. Culm-nodes glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane. Leaf-blades filiform; convolute; 0.6–0.8 mm wide. Leaf-blade surface ribbed; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; dense; 5–12 cm long. Primary panicle branches bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 9–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Floret callus pilose.

GLUMES Glumes persistent; dissimilar; reaching apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 7–8 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins obscure. Lower glume apex acuminate. Upper glume lanceolate; 9–10 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Basal sterile florets male; with palea; attached to and deciduous with the fertile. Lemma of lower sterile floret elliptic; 7–8 mm long; chartaceous; much thinner above; pubescent; dentate; 2 -fid; acute, or acuminate; awned. Awn of lower sterile floret dorsal; arising 0.5–0.8 way up back of lemma; geniculate; 12–15 mm long. Fertile lemma elliptic; 7–8 mm long; chartaceous; much thinner above; without keel; 7 -veined. Lemma surface pubescent. Lemma apex acuminate; muticous, or awned; 1 -awned. Principal lemma awn subapical; 0–2 mm long overall. Palea 6–7 mm long. Palea keels ciliolate.

FLOWER Anthers 3. Ovary pubescent all over.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Europe: southwestern.

NOTES Aveneae. Fl Eur 1993.

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