1. Family: Poaceae Barnhart
    1. Genus: Muhlenbergia Schreb.
      1. Muhlenbergia rigens (Benth.) Hitchc.

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

    [GB]
    Habit
    Perennial; caespitose. Culms erect; 60-100 cm long. Ligule an eciliate membrane, or a ciliolate membrane; 1-3 mm long. Leaf-blades involute; 15-50 cm long; 1-4 mm wide; stiff. Leaf-blade surface ribbed; scabrous; rough adaxially. Leaf-blade apex filiform.
    Inflorescences
    Inflorescence a panicle. Panicle spiciform; linear; continuous, or interrupted; 30-60 cm long. Primary panicle branches 1-4 cm long. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 2.5-3.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 2.5-3.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume lanceolate; 2-3 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex obtuse, or acute. Upper glume lanceolate; 2-3 mm long; 0.8 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface scabrous. Upper glume apex obtuse, or acute.
    Florets
    Fertile lemma elliptic; 2.5-3.5 mm long; membranous; without keel; 3 -veined. Lemma midvein pubescent; hairy above. Lemma surface scaberulous; rough above. Lemma margins pubescent; hairy below. Lemma apex obtuse, or acute; muticous, or mucronate. Palea 1 length of lemma; 2 -veined. Palea surface scabrous.
    Flowers
    Lodicules 2; cuneate; fleshy. Anthers 3; 1.5-1.7 mm long.
    Fruits
    Caryopsis with adherent pericarp; fusiform; 2 mm long.
    Distribution
    North America: southwest USA, south-central USA, and Mexico.
    Reference
    Eragrostideae. WDC.

    Images

    Distribution

    Native to:

    Arizona, California, Mexico Northeast, Mexico Northwest, Mexico Southwest, Nevada, New Mexico, Texas

    Muhlenbergia rigens (Benth.) Hitchc. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Townsend [341], Mexico K000308920
    Bollander [24] K000308921 Unknown type material

    First published in J. Washington Acad. Sci. 23: 453 (1933)

    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