1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus interruptus Buckley

        This species is accepted, and its native range is Arizona to Texas.

    [GB]
    Habit
    Perennial. Culms 60-130 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane. Leaf-blades 15-30 cm long; 5-12 mm wide. Leaf-blade surface scabrous.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; flexuous; bilateral; 8-20 cm long. Rhachis flattened. Spikelet packing broadside to rhachis. Rhachis internodes linear. Rhachis internode tip flat. Spikelets in pairs. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1-2 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 10 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 1-2 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 10 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes collateral; persistent; similar; shorter than spikelet. Lower glume subulate; 10-30 mm long; 1 length of upper glume; coriaceous; 1 -veined. Lower glume surface puberulous. Upper glume subulate; 10-30 mm long; coriaceous; 1 -veined. Upper glume surface puberulous.
    Florets
    Fertile lemma elliptic; 10 mm long; 2 mm wide; chartaceous; 5 -veined. Lemma lateral veins distinct (above). Lemma surface scabrous; glabrous, or pubescent. Lemma apex acute; awned; 1 -awned. Principal lemma awn flexuous; 10-30 mm long overall. Palea 1 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3. Stigmas 2. Ovary pubescent on apex.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    North America: northwest USA, north-central USA, northeast USA, south-central USA, southeast USA, and Mexico.
    Reference
    Triticeae. Man US Gr 1994.

    Distribution

    Native to:

    Arizona, New Mexico, Texas

    Elymus interruptus Buckley appears in other Kew resources:

    First published in Proc. Acad. Nat. Sci. Philadelphia 14: 99 (1862 publ. 1863)

    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.
    • Govaerts, R. (2001). World Checklist of Seed Plants Database in ACCESS E-F: 1-50919.

    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