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  1. Family: Poaceae Barnhart
    1. Genus: Leymus Hochst.
      1. Leymus flavescens (Scribn. & J.G.Sm.) Pilg.

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

    [GB]
    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.
    Inflorescences
    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.
    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.
    Fertile
    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.
    Glume
    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.
    Flowers
    Anthers 6 mm long.
    Distribution
    North America: northwest USA and north-central .
    Reference
    Triticeae. Fl Pac NW 1994.

    Distribution

    Native to:

    Alberta, Idaho, Montana, Oregon, Utah, Washington

    Synonyms

    Other Data

    Leymus flavescens (Scribn. & J.G.Sm.) Pilg. appears in other Kew resources:

    Bibliography

    First published in Bot. Jahrb. Syst. 74: 6 (1947)

    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 2020. 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 2020. 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