1. Family: Poaceae Barnhart
    1. Oryzopsis Michx.

      1. This genus is accepted, and its native range is China, Subarctic America to U.S.A.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes absent (7), or short (1). Culms erect (7), or geniculately ascending (1), or prostrate (1); 10-38.12-90 cm long. Lateral branches lacking (1/1). Ligule an eciliate membrane (7), or a ciliolate membrane (1). Leaf-blades filiform (3), or linear (5); herbaceous (7), or coriaceous (1); stiff (1), or firm (7).
    Inflorescences
    Inflorescence a panicle; exserted, or embraced at base by subtending leaf (2). Panicle open (4), or contracted (4). Spikelets appressed (1/1); solitary. Fertile spikelets pedicelled. Pedicels filiform (1/1).
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic (2), or oblong (2), or ovate (4); dorsally compressed; 3.5-5.75-8 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pubescent (1/1). Floret callus brief (5), or evident (3); pubescent (3/6), or pilose (3/6).
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic (2), or oblong (2), or ovate (4); dorsally compressed; 3.5-5.75-8 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pubescent (1/1). Floret callus brief (5), or evident (3); pubescent (3/6), or pilose (3/6).
    Glume
    Glumes persistent; shorter than spikelet (1), or reaching apex of florets (4), or exceeding apex of florets (3); thinner than fertile lemma; parallel to lemmas (7), or gaping (1). Lower glume oblong (3), or ovate (5); 0.9-1.012-1.2 length of upper glume; hyaline (1), or membranous (7); without keels; 3 -veined (4), or 4 -veined (2), or 5 -veined (4), or 7 -veined (2). Lower glume lateral veins obscure (2), or distinct (5), or prominent (1). Lower glume surface glabrous (7), or puberulous (3). Lower glume apex truncate (1), or obtuse (1), or acute (3), or acuminate (3), or attenuate (1). Upper glume oblong (3), or ovate (5); 0.9-1.268-2 length of adjacent fertile lemma; hyaline (1), or membranous (7); without keels; 3 -veined (4), or 4 -veined (2), or 5 -veined (4), or 7 -veined (2). Upper glume surface glabrous (7), or puberulous (3). Upper glume apex truncate (1), or obtuse (1), or acute (3), or acuminate (3), or attenuate (1).
    Florets
    Fertile lemma elliptic (1), or oblong (3), or ovate (4); dorsally compressed; coriaceous; without keel; 5 -veined (3/3). Lemma surface glabrous (1), or pubescent (5), or hirsute (1), or villous (1); hairy on back (7/7), or on veins (1/7). Lemma margins convolute; covering most of palea. Lemma apex entire (6), or dentate (2); 2 -fid (2/2); obtuse (3/5), or acute (2/5); muticous (1), or awned; 1 -awned. Principal lemma awn apical (6), or from a sinus (2); straight (5), or curved (1), or flexuous (1), or geniculate (1). Palea 1 length of lemma; membranous (1), or coriaceous (7); 2 -veined; without keels.
    Flowers
    Lodicules 2 (1/2), or 3 (1/2). Anthers 3 (2/2).
    Fruits
    Caryopsis apex rostrate (6/6).
    Distribution
    Temperate Asia (1), or North America.

    Images

    Distribution

    Native to:

    Alberta, British Columbia, China North-Central, China Southeast, Colorado, Connecticut, Idaho, Illinois, Indiana, Inner Mongolia, 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., Qinghai, Québec, Rhode I., Saskatchewan, South Dakota, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon

    Oryzopsis Michx. appears in other Kew resources:

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

    Accepted by

    • Govaerts, R. (2019). World Checklist of Vascular Plants (WCVP Database) The Board of Trustees of the Royal Botanic Gardens, Kew.

    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