1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus arizonicus (Scribn. & J.G.Sm.) Gould

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

    [GB]
    Habit
    Perennial; caespitose. Culms erect; 60-100 cm long. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 2-4 mm long. Leaf-blades flat, or conduplicate; 2.5-6 mm wide; glaucous. Leaf-blade surface glabrous, or puberulous.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; flexuous; bilateral; 10-25 cm long. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis; lax. Rhachis internodes linear; 9-15 mm long. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 15 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
    Fertile
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 15 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
    Glume
    Glumes collateral; persistent; similar; shorter than spikelet. Lower glume lanceolate; 8-10 mm long; 1 length of upper glume; coriaceous; without keels; 3-5 -veined. Lower glume apex acute, or acuminate; muticous, or awned; 1 -awned. Lower glume awn 0-8 mm long. Upper glume lanceolate; 8-10 mm long; 1 length of adjacent fertile lemma; coriaceous; without keels; 3-5 -veined. Upper glume apex acute, or acuminate; muticous, or awned; 1 -awned. Upper glume awn 0-8 mm long.
    Florets
    Fertile lemma lanceolate; 10 mm long; coriaceous; 5-7 -veined. Lemma surface smooth, or scaberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; 15-30 mm long overall; limb scabrous. 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: southwest USA, south-central USA, and Mexico. South America: Mesoamericana.
    Reference
    Triticeae. Gr Tex 1993.

    Distribution

    Native to:

    Arizona, California, Colorado, Guatemala, Mexico Central, Mexico Northeast, Mexico Northwest, New Mexico, Texas

    Elymus arizonicus (Scribn. & J.G.Sm.) Gould appears in other Kew resources:

    First published in Madroño 9: 125 (1947)

    Accepted by

    • Ackerfield, J. (2015). Flora of Colorado: 1-818. BRIT Press.
    • 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.
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.

    Literature

    Kew Backbone Distributions
    • Ackerfield, J. (2015). Flora of Colorado: 1-818. BRIT Press.
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.

    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