1. Family: Poaceae Barnhart
    1. Genus: Festuca Tourn. ex L.
      1. Festuca hallii (Vasey) Piper

        This species is accepted, and its native range is Canada to NW. & W. Central U.S.A.

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms erect; 30-90 cm long; 2 -noded. Culm-internodes smooth, or scaberulous. Leaf-sheaths tight; antrorsely scabrous. Leaf-sheath auricles absent. Ligule a ciliolate membrane. Leaf-blades involute; 10-50 cm long; 1-2 mm wide; stiff. Leaf-blade surface scabrous. Leaf-blade apex acute; pungent.
    Inflorescences
    Inflorescence a panicle. Panicle open; lanceolate; equilateral, or nodding; 3-15 cm long. Primary panicle branches appressed, or ascending; 1-2 -nate. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 8-12 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 8-12 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 7-8 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 8-9 mm long; 1 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 8-10 mm long; chartaceous; without keel; rounded except near apex; 5 -veined. Lemma surface scaberulous. Lemma apex acute; mucronate. Palea 1 length of lemma; 2 -veined. Palea keels pubescent. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2. Anthers 3.
    Fruits
    Caryopsis with adherent pericarp. Hilum linear.
    Distribution
    North America: western Canada, eastern Canada, and northwest USA.
    Reference
    Poeae. Piper 2004.

    Distribution

    Native to:

    Alberta, Colorado, Manitoba, Montana, New Mexico, North Dakota, Ontario, Saskatchewan, Washington, Wyoming

    Festuca hallii (Vasey) Piper appears in other Kew resources:

    First published in Contr. U.S. Natl. Herb. 10: 31 (1906)

    Accepted by

    • Allred, K.W. (2012). Flora Neomexicana, ed. 2, 1: 1-599. Range Science Herbarium, Las Cruces, New Mexico.
    • 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
    • Allred, K.W. (2012). Flora Neomexicana, ed. 2, 1: 1-599. Range Science Herbarium, Las Cruces, New Mexico.
    • 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 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