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

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

    [GB]
    Habit
    Perennial; caespitose; clumped loosely. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 40-80 cm long. Leaf-sheaths striately veined; glabrous on surface, or pubescent. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades flat, or involute; 5-10 cm long; 1.5-2.5 mm wide. Leaf-blade surface puberulous; hairy adaxially.
    Inflorescences
    Inflorescence a panicle. Panicle open; ovate; 6-15 cm long. Primary panicle branches ascending, or spreading; 2 -nate. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 3-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1-1.5 mm long; eventually visible between lemmas.
    Fertile
    Spikelets comprising 3-7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1-1.5 mm long; eventually visible between lemmas.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5-5 mm long; 0.5-0.75 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.5-7 mm long; 0.75 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acute.
    Florets
    Fertile lemma elliptic; 6-8.5 mm long; chartaceous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex acute; muticous, or mucronate. Palea 1 length of lemma; 2 -veined. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 2-4 mm long.
    Fruits
    Caryopsis with adherent pericarp. Hilum linear.
    Distribution
    North America: western Canada, northwest USA, and southwest USA.
    Reference
    Poeae. Fl Pac NW 1993.

    Images

    Distribution

    Native to:

    British Columbia, California, Colorado, Idaho, Montana, Nevada, Oregon, Washington

    Festuca viridula Vasey appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Dec 1, 1978 Bolander, H.N. [s.n.], California K000913334 isotype
    Dec 1, 1978 Howell, T.J. [s.n.], Oregon K000913333 isotype

    First published in Bull. Div. Bot. U.S.D.A. 13(2): t. 93 (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.

    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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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