1. Family: Poaceae Barnhart
    1. Genus: Festuca Tourn. ex L.
      1. Festuca occidentalis Hook.

        This species is accepted, and its native range is Alaska to N. & W. U.S.A.

    [GB]
    Habit
    Perennial; caespitose. Culms 60-110 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5 mm long. Collar glabrous. Leaf-blades filiform; involute; 0.5-1 mm wide. Leaf-blade surface scaberulous; rough adaxially; glabrous.
    Inflorescences
    Inflorescence a panicle. Panicle open; elliptic; loose; 10-20 cm long. Primary panicle branches drooping; 1-2 -nate. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 4-6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 6-10 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 4-6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 6-10 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; 2-4 mm long; 0.8-0.9 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acute. Upper glume lanceolate; 3-4.5 mm long; 0.7-0.8 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume surface smooth, or asperulous. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 4-6 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface smooth, or scaberulous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn flexuous; 4-12 mm long overall. Palea 1 length of lemma; 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: western Canada, eastern Canada, northwest USA, north-central USA, northeast USA, and southwest USA.
    Reference
    Poeae. Fl Pac NW 1994.

    Images

    Distribution

    Native to:

    Alaska, Alberta, British Columbia, California, Idaho, Michigan, Montana, Ontario, Oregon, South Dakota, Utah, Washington, Wisconsin, Wyoming

    Festuca occidentalis Hook. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Dec 1, 1978 Douglas, D. [228] K000913323 syntype
    Dec 1, 1978 Douglas, D. [224] K000913324 lectotype
    Dec 1, 1978 Scouler, J. [147] K000913322 syntype

    First published in Fl. Bor.-Amer. 2: 249 (1840)

    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 2019. 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 2019. 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