1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus elymoides (Raf.) Swezey

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

    [GB]
    Habit
    Perennial. Culms 10-50 cm long. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades 5-20 cm long; 1-3 mm wide.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; bilateral; 2-7(-10) cm long. Rhachis fragile at the nodes. Spikelet packing broadside to rhachis. Rhachis internodes linear; falling with spikelet above. Spikelets spreading; in pairs. Fertile spikelets sessile; 2 in the cluster; heteromorphic (some with sterile lower floret).
    Spikelets
    Spikelets comprising 0-1 basal sterile florets; 1-2 fertile florets; with diminished florets at the apex. Spikelets lanceolate; dorsally compressed; 6-10 mm long; falling entire; deciduous with accessory branch structures; readily shedding fertile florets. Floret callus evident.
    Fertile
    Spikelets comprising 0-1 basal sterile florets; 1-2 fertile florets; with diminished florets at the apex. Spikelets lanceolate; dorsally compressed; 6-10 mm long; falling entire; deciduous with accessory branch structures; readily shedding fertile florets. Floret callus evident.
    Glume
    Glumes collateral; similar; exceeding apex of florets; gaping. Lower glume subulate; 20-100 mm long; 1 length of upper glume; 1-2 -veined. Lower glume surface scabrous. Lower glume apex entire, or lobed; 2 -fid. Upper glume subulate; 20-100 mm long; 1-2 -veined. Upper glume surface scabrous. Upper glume apex entire, or dentate; 2 -fid.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret subulate; 20-100 mm long; scabrous. Fertile lemma lanceolate; 6-10 mm long; coriaceous; without keel; 5 -veined. Lemma surface smooth, or scabrous; glabrous, or pubescent. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn curved; spreading; 20-100 mm long overall; limb scabrous. Palea coriaceous. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Ovary with a fleshy appendage below style insertion; pubescent on apex.
    Distribution
    North America: western Canada, northwest USA, north-central USA, southwest USA, south-central USA, and Mexico.
    Reference
    Triticeae. WDC.

    Distribution

    Native to:

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

    Introduced into:

    District of Columbia

    Elymus elymoides (Raf.) Swezey appears in other Kew resources:

    First published in Nebraska Fl. Pl.: 15 (1891)

    Accepted by

    • Valdés-Reyna, J. Villaseñor, J.L., Encina-Domínguez, J.A. & Oritz, E. (2015). The grass family (Poaceae) in Coahuila, Mexico: diversity and distribution Botanical Sciences 93: 119-129.
    • Ackerfield, J. (2015). Flora of Colorado: 1-818. BRIT Press.
    • Ibrahim, K.M. & Peterson, P.M. (2014). Grasses of Washington, D.C. Smithsonian Contributions to Botany 99: 1-128.
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

    Not accepted by

    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Sitanion hystrix.]

    Literature

    Kew Backbone Distributions
    • Valdés-Reyna, J. Villaseñor, J.L., Encina-Domínguez, J.A. & Oritz, E. (2015). The grass family (Poaceae) in Coahuila, Mexico: diversity and distribution Botanical Sciences 93: 119-129.
    • Ibrahim, K.M. & Peterson, P.M. (2014). Grasses of Washington, D.C. Smithsonian Contributions to Botany 99: 1-128.
    • 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