1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus × yukonensis (Scribn. & Merr.) Á.Löve

        This species is accepted, and its native range is Alaska to W. Canada.

    [GB]
    Habit
    Perennial; mat forming. Rhizomes elongated. Culms 20-50 cm long. Culm-nodes glabrous. Leaf-sheaths puberulous. Ligule an eciliate membrane; 0.4-0.5 mm long; entire, or erose. Leaf-blades 2-5 cm long; 1-4 mm wide; coriaceous; stiff; glaucous. Leaf-blade surface ribbed; puberulous; hairy adaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; bilateral; 4-10 cm long. Rhachis flattened. Spikelet packing broadside to rhachis. Rhachis internodes linear. Rhachis internode tip flat. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 9-12 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 9-12 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes collateral; persistent; similar; shorter than spikelet. Lower glume lanceolate; 5-6 mm long; 1 length of upper glume; coriaceous; without keels; 2-4 -veined. Lower glume lateral veins ribbed. Lower glume apex acute. Upper glume lanceolate; 5-6 mm long; 1 length of adjacent fertile lemma; coriaceous; without keels; 2-4 -veined. Upper glume lateral veins ribbed. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate to oblong; 7-10 mm long; coriaceous; 5-7 -veined. Lemma surface pilose. Lemma apex acute; muticous, or awned; 1 -awned. Principal lemma awn 0-10 mm long overall. Palea 1 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3; 3-5 mm long. Stigmas 2. Ovary pubescent on apex.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    North America: Subarctic.
    Reference
    Triticeae. Fl Alaska 1994.

    Distribution

    Native to:

    Alaska, British Columbia

    Elymus × yukonensis (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 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