1. Family: Poaceae Barnhart
    1. Genus: Muhlenbergia Schreb.
      1. Muhlenbergia richardsonis (Trin.) Rydb.

        This species is accepted, and its native range is N. America.

    [GB]
    Habit
    Perennial; mat forming. Rootstock evident. Rhizomes short; scaly. Culms erect, or geniculately ascending; 5-60 cm long. Culm-internodes striate; scaberulous (nodulose). Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1.5-2(-3) mm long; erose. Leaf-blades flat, or involute; 1-5 cm long; 1-1.5 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; puberulous; hairy adaxially.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; interrupted; 2-10 cm long. Primary panicle branches appressed. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5-3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5-3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 1-1.5 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse, or acute. Upper glume oblong; 1-1.5 mm long; 0.4-0.5 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex obtuse, or acute.
    Florets
    Fertile lemma lanceolate; 2.5-3 mm long; membranous; without keel; 3 -veined. Lemma surface scabrous; rough above. Lemma apex acute, or acuminate; muticous, or mucronate. Palea 0.9 length of lemma; 2 -veined. Palea surface scaberulous.
    Flowers
    Lodicules 2; cuneate; fleshy. Anthers 3; 1.2-1.5 mm long.
    Fruits
    Caryopsis with adherent pericarp; fusiform; 1.2 mm long; light brown.
    Distribution
    North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, and Mexico.
    Reference
    Eragrostideae. Gr Baja Cal 1994.

    Images

    Distribution

    Native to:

    Alaska, Alberta, Arizona, British Columbia, California, Colorado, Idaho, Maine, Manitoba, Mexico Central, Mexico Northeast, Mexico Northwest, Michigan, Minnesota, Montana, Nebraska, Nevada, New Brunswick, New Mexico, North Dakota, Northwest Territorie, Ontario, Oregon, Québec, Saskatchewan, South Dakota, Utah, Washington, Wisconsin, Wyoming, Yukon

    Muhlenbergia richardsonis (Trin.) Rydb. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Douglas, D. [241], USA K000907287
    s.coll. [5], USA K000907288

    First published in Bull. Torrey Bot. Club 32: 600 (1905)

    Accepted by

    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.

    Literature

    Kew Backbone Distributions
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. 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