1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis rubescens Buckley

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

    [GB]
    Habit
    Perennial. Rhizomes elongated. Culms 50-110 cm long. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 1-3 mm long; lacerate; obtuse, or acute. Collar pubescent. Leaf-blades 2-4 mm wide. Leaf-blade surface scabrous.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; 4-15 cm long; 1-2.5 cm wide. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 1 mm long; 0.25 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 1 mm long; 0.25 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 4-5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1-3 -veined. Upper glume primary vein smooth. Upper glume apex acuminate.
    Florets
    Fertile lemma lanceolate; 3.5-4.5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 5-6 mm long overall; clearly exserted from spikelet; with twisted column. Palea 1 length of lemma. Rhachilla extension 1.2 mm long; villous; with 2 mm long hairs.
    Flowers
    Lodicules 2; 0.6 mm long. Anthers 3; 2.5 mm long. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    North America: western Canada, northwest USA, and southwest USA.
    Reference
    Aveneae. Fl Pac NW 1994.

    Distribution

    Native to:

    Alberta, British Columbia, California, Colorado, Idaho, Manitoba, Montana, Nevada, Oregon, Saskatchewan, Utah, Washington, Wyoming

    Calamagrostis rubescens Buckley appears in other Kew resources:

    First published in Proc. Acad. Nat. Sci. Philadelphia 14: 92 (1862 publ. 1863)

    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

    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