1. Family: Poaceae Barnhart
    1. Genus: Leymus Hochst.
      1. Leymus cinereus (Scribn. & Merr.) Á.Löve

        This species is accepted, and its native range is W. Canada to W. & W. Central U.S.A.

    [GB]
    Habit
    Perennial; caespitose. Rhizomes short. Culms 100-200 cm long. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 3-7 mm long. Leaf-blades flat; 20-50 cm long; 10-20 mm wide; coriaceous; stiff. Leaf-blade surface ribbed; glabrous, or pubescent.
    Inflorescences
    Inflorescence composed of racemes. Peduncle pubescent above. Racemes 1; single; erect; bilateral; 12-20 cm long; simple, or secondarily branched. Rhachis flattened. Spikelet packing broadside to rhachis. Spikelets clustered at each node. Fertile spikelets pedicelled, or sessile; 3-6 in the cluster.
    Spikelets
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15-20 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15-20 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes collateral; persistent; similar; reaching apex of florets, or shorter than spikelet. Lower glume subulate; 10-20 mm long; 1 length of upper glume. Upper glume subulate; 10-20 mm long; 1-1.3 length of adjacent fertile lemma.
    Florets
    Fertile lemma lanceolate; 10-15 mm long; coriaceous; without keel; 5 -veined. Lemma surface glabrous, or pubescent. Lemma apex acute; muticous, or awned; 1 -awned. Principal lemma awn 2-7 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3; 3-6 mm long. Stigmas 2. Ovary pubescent on apex.
    Fruits
    Caryopsis with adherent pericarp. Hilum linear.
    Distribution
    North America: western Canada, northwest USA, north-central USA, and southwest USA.
    Reference
    Triticeae. WDC.

    Distribution

    Native to:

    Alberta, Arizona, British Columbia, California, Colorado, Idaho, Minnesota, Montana, Nebraska, Nevada, New Mexico, Oregon, Saskatchewan, South Dakota, Utah, Washington, Wyoming

    Leymus cinereus (Scribn. & Merr.) Á.Löve appears in other Kew resources:

    First published in Taxon 29: 168 (1980)

    Accepted by

    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Kew Backbone Distributions
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

    Sources

    GrassBase - The Online World Grass Flora
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0