1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus multisetus (J.G.Sm.) Burtt Davy

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

    [GB]
    Habit
    Perennial; caespitose. Culms erect, or geniculately ascending; 25-60 cm long. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades 3-6 mm wide. Leaf-blade surface glabrous to hirsute; hairy on both sides.
    Inflorescences
    Inflorescence composed of racemes; exserted, or embraced at base by subtending leaf. Racemes 1; single; oblong; bilateral; 5.5-12 cm long. Rhachis fragile at the nodes. Spikelet packing broadside to rhachis. Rhachis internodes linear; falling with spikelet above. Spikelets ascending; in pairs. Fertile spikelets sessile; 2(-4) in the cluster; heteromorphic (one in each pair with sterile lower floret).
    Spikelets
    Spikelets comprising 0-1 basal sterile florets; 1-3 fertile florets; with diminished florets at the apex. Spikelets lanceolate; dorsally compressed; 8-10 mm long; falling entire; deciduous with accessory branch structures; readily shedding fertile florets. Floret callus evident.
    Fertile
    Spikelets comprising 0-1 basal sterile florets; 1-3 fertile florets; with diminished florets at the apex. Spikelets lanceolate; dorsally compressed; 8-10 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 linear, or elliptic; 2-6 mm long; 1 length of upper glume; coriaceous; 3-9 -veined. Lower glume apex dentate; 3-9 -fid; awned; 3-9 -awned (unequally). Lower glume awn 25-100 mm long. Upper glume linear, or elliptic; 2-6 mm long; coriaceous; 3-9 -veined. Upper glume apex dentate; 3-9 -fid; awned; 3-9 -awned (unequally). Upper glume awn 25-100 mm long.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; linear, or oblong; 2-6 mm long; coriaceous; dentate; 2-3 -fid; awned (2-3 awned). Awn of lower sterile floret 25-100 mm long. Fertile lemma lanceolate; 8-10 mm long; coriaceous; without keel; 5 -veined. Lemma surface smooth, or scabrous; rough above. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; 30-100 mm long overall. Lateral lemma awns arising on apex of lobes; 1-20 mm long; shorter than principal. Palea coriaceous. Palea keels scabrous. Palea apex with excurrent keel veins. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Ovary with a fleshy appendage below style insertion; pubescent on apex.
    Distribution
    North America: northwest USA, southwest USA, and Mexico.
    Reference
    Triticeae. WDC.

    Distribution

    Native to:

    Arizona, California, Colorado, Idaho, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming

    Elymus multisetus (J.G.Sm.) Burtt Davy appears in other Kew resources:

    First published in Univ. Calif. Publ. Bot. 1: 57 (1902)

    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.

    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 jubatum.]

    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