1. Family: Poaceae Barnhart
    1. Genus: Oryzopsis Michx.
      1. Oryzopsis asperifolia Michx.

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

    [GB]
    Habit
    Perennial; caespitose. Culms geniculately ascending, or prostrate; 20-70 cm long. Ligule an eciliate membrane. Leaf-blades flat, or revolute; 15-40 cm long; 3-8 mm wide; glaucous. Leaf-blade surface ungrooved; scabrous. Leaf-blade apex abruptly acute.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; 5-8 cm long; contracted about primary branches. Primary panicle branches appressed; indistinct the panicle almost racemose; 2-6 cm long. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 3-6 mm long.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 6-8 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pubescent. Floret callus pubescent.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 6-8 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pubescent. Floret callus pubescent.
    Glume
    Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 6-8 mm long; 1 length of upper glume; membranous; without keels; 7 -veined. Lower glume apex acute. Upper glume ovate; 6-8 mm long; 1 length of adjacent fertile lemma; membranous; without keels; 7 -veined. Upper glume apex acute.
    Florets
    Fertile lemma ovate; dorsally compressed; 6-8 mm long; coriaceous; pallid, or yellow; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 1 -awned. Principal lemma awn flexuous; 5-10 mm long overall; deciduous. Palea coriaceous; 2 -veined; without keels.
    Flowers
    Styles connate below.
    Fruits
    Caryopsis apex rostrate.
    Distribution
    North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, northeast USA, southwest USA, and south-central USA.
    Reference
    Stipeae. WDC.

    Distribution

    Native to:

    Alberta, British Columbia, Colorado, Connecticut, Idaho, Illinois, Indiana, Iowa, Maine, Manitoba, Maryland, Masachusettes, Michigan, Minnesota, Montana, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Dakota, Northwest Territorie, Nova Scotia, Ohio, Ontario, Pennsylvania, Prince Edward I., Québec, Rhode I., Saskatchewan, South Dakota, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon

    Oryzopsis asperifolia Michx. appears in other Kew resources:

    First published in Fl. Bor.-Amer. 1: 51 (1803)

    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