1. Family: Poaceae Barnhart
    1. Genus: Festuca Tourn. ex L.
      1. Festuca arizonica Vasey

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

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Butt sheaths light brown. Culms erect; 45-90 cm long; wiry. Leaf-sheaths wider than blade at the collar; smooth, or scaberulous; glabrous on surface. Leaf-sheath auricles erect; 0.5-1.5 mm long. Ligule a ciliolate membrane; 0.5-1.5 mm long. Leaf-blades filiform; conduplicate, or involute; 20-50 cm long; 1-1.5 mm wide; glaucous. Leaf-blade surface scabrous; glabrous.
    Inflorescences
    Inflorescence a panicle. Panicle open, or contracted; linear, or lanceolate; 8-18 cm long. Primary panicle branches appressed, or ascending. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 4-8 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 8-15 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 4-8 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 8-15 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes persistent; similar; with lower narrower than upper; shorter than spikelet. Lower glume lanceolate; 5-6.5 mm long; 0.9 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous; rough at apex. Lower glume apex acute. Upper glume lanceolate; 5-6.5 mm long; 0.9 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume surface scabrous; rough at apex. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 5.5-7 mm long; chartaceous; without keel; 5 -veined. Lemma apex acute; scabrous; muticous, or mucronate, or awned. Principal lemma awn ascending; 0-2 mm long overall. Palea 2 -veined. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 2-3 mm long.
    Fruits
    Caryopsis with adherent pericarp. Hilum linear.
    Distribution
    North America: northwest USA, southwest USA, south-central USA, and Mexico.
    Reference
    Poeae. Gr Texas 1994.

    Distribution

    Native to:

    Arizona, Colorado, Mexico Central, Mexico Northeast, Nevada, New Mexico, Texas, Utah, Venezuela

    Festuca arizonica Vasey appears in other Kew resources:

    First published in Contr. U.S. Natl. Herb. 1: 277 (1893)

    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.
    • 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.

    Literature

    Kew Backbone Distributions
    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • 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.

    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 2018. 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 2018. 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