1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus wawawaiensis J.R.Carlson & Barkworth

        This species is accepted, and its native range is NW. U.S.A.

    [GB]
    Habit
    Perennial; caespitose. Butt sheaths pubescent. Culms 15-130 cm long. Leaf-sheaths 6-18 cm long; glabrous on surface; outer margin glabrous. Ligule an eciliate membrane. Leaf-blades 13-26 cm long; 2-5 mm wide. Leaf-blade surface pubescent; densely hairy; hairy adaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; erect, or drooping; bilateral; 6-20 cm long. Rhachis flattened. Spikelet packing broadside to rhachis. Rhachis internodes linear; 5-10 mm long. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 4-10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 10-20 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
    Fertile
    Spikelets comprising 4-10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 10-20 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
    Glume
    Glumes collateral; persistent; similar; shorter than spikelet. Lower glume linear, or lanceolate; 4-10 mm long; 1 length of upper glume; membranous; without keels; 1-3 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume linear, or lanceolate; 4-10 mm long; 1 length of adjacent fertile lemma; membranous; without keels; 1-3 -veined. Upper glume lateral veins absent, or obscure. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate to oblong; 7-12 mm long; coriaceous; 5-7 -veined. Lemma lateral veins obscure. Lemma surface smooth, or asperulous. Lemma margins pubescent; hairy below. Lemma apex acute; awned; 1 -awned. Principal lemma awn spreading; 10-25 mm long overall. Palea surface pubescent. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2. Anthers 3; 3-6 mm long.
    Distribution
    North America: northwest USA.
    Reference
    Triticeae. Carlson & Barkworth 2004.

    Distribution

    Native to:

    Idaho, Oregon, Washington

    Elymus wawawaiensis J.R.Carlson & Barkworth appears in other Kew resources:

    First published in Phytologia 83: 327 (1998)

    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