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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Leymus flavescens
HABIT Perennial; caespitose. Rhizomes elongated. Culms 60–100 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5–1.5 mm long. Leaf-blades involute; 3–5 mm wide; coriaceous; stiff; glaucous. Leaf-blade surface ribbed; scaberulous; rough abaxially.
INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.
Racemes 1; single; erect; bilateral; 10–20 cm long. Spikelet packing broadside to rhachis. Rhachis internodes linear.
Spikelets in pairs. Fertile spikelets sessile, or sessile and pedicelled; 2 in the cluster. Pedicels 5–15 mm long.
FERTILE SPIKELETS Spikelets comprising 5–9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12–25 mm long; breaking up at maturity; disarticulating below each fertile floret.
GLUMES Glumes collateral; persistent; similar; shorter than spikelet. Lower glume subulate; 10–15 mm long; coriaceous; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume surface pubescent. Upper glume subulate; 10–15 mm long; coriaceous; 1–3 -veined. Upper glume lateral veins absent, or distinct. Upper glume surface pubescent.
FLORETS Fertile lemma lanceolate; 11–15 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins prominent. Lemma surface pubescent, or pilose. Lemma apex acute; muticous. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Anthers 6 mm long.
DISTRIBUTION North America: northwest USA and north-central USA.
NOTES Triticeae. Fl Pac NW 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.