1. Family: Poaceae Barnhart
    1. Genus: Leymus Hochst.
      1. Leymus ambiguus (Vasey & Scribn.) D.R.Dewey

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

    [GB]
    Habit
    Perennial; caespitose. Rhizomes absent, or short. Culms 30-90 cm long. Leaf-sheaths glabrous on surface, or pubescent. Leaf-sheath auricles absent, or falcate. Ligule a ciliolate membrane; 0.5-1.5 mm long. Leaf-blades involute; 5-20 cm long; 1-4 mm wide; coriaceous; stiff; glaucous. Leaf-blade surface ribbed; pubescent, or pilose; hairy abaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; erect; bilateral; 5-15 cm long. Spikelet packing broadside to rhachis. Rhachis internodes linear. Spikelets in pairs. Fertile spikelets sessile; 2 in the cluster.
    Spikelets
    Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 9-15 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 9-15 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes collateral; persistent; similar. Lower glume subulate; 3-15 mm long; coriaceous; 1 -veined. Lower glume lateral veins absent. Lower glume surface glabrous, or pubescent. Upper glume subulate; 3-15 mm long; coriaceous; 1 -veined. Upper glume lateral veins absent. Upper glume surface glabrous, or pubescent.
    Florets
    Fertile lemma lanceolate; 7-12 mm long; coriaceous; without keel; 5 -veined. Lemma surface puberulous. Lemma apex acute; muticous, or awned; 1 -awned. Principal lemma awn 0-5 mm long overall. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 4-7 mm long.
    Distribution
    North America: northwest USA and southwest .
    Reference
    Triticeae. Fl Pac NW 1994.

    Images

    Distribution

    Native to:

    Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, Wyoming

    Leymus ambiguus (Vasey & Scribn.) D.R.Dewey appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Hitchcock, C.L. [22305], Idaho K001065446
    Vasey, G. [s.n.], Colorado K001065445

    First published in Brittonia 35: 32 (1983)

    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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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