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  1. Family: Poaceae Barnhart
    1. Genus: Muhlenbergia Schreb.
      1. Muhlenbergia pectinata Goodd.

        This species is accepted, and its native range is S. Arizona to Mexico.

    [GB]
    Habit
    Annual. Culms decumbent; 10-33 cm long; 0.3-0.5 mm diam.; without nodal roots, or rooting from lower nodes. Culm-internodes 1-38 cm long. Lateral branches ample; arising from lower culm and mid culm. Leaf-sheaths 1.2-4 cm long; longer than adjacent culm internode; glabrous on surface; outer margin hairy. Ligule a ciliate membrane; 0.3-0.4 mm long. Leaf-blades flat, or involute; 1-6 cm long; 0.6-2 mm wide. Leaf-blade surface pubescent, or pilose.
    Inflorescences
    Inflorescence a panicle; exserted, or embraced at base by subtending leaf. Panicle open, or contracted; oblong; 4-12 cm long; 0.5-2.6 cm wide. Primary panicle branches appressed, or ascending; 1 -nate; 2-3.5 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-3 mm long; smooth.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 0.8-1.7 mm long; 0.8 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate; muticous, or mucronate, or awned; 1 -awned. Lower glume awn 0-1.5 mm long. Upper glume lanceolate; 1-2 mm long; 0.33-0.5 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or acuminate; muticous, or mucronate, or awned; 1 -awned. Upper glume awn 0-1.5 mm long.
    Florets
    Fertile lemma linear, or lanceolate; 3-4.5 mm long; membranous; without keel; 3 -veined. Lemma lateral veins prominent. Lemma surface smooth, or scaberulous; rough in lines. Lemma margins eciliate, or ciliate; hairy above. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn flexuous; 10-32 mm long overall. Palea 2.4-4.4 mm long; 2 -veined. Palea surface glabrous.
    Flowers
    Lodicules 2; cuneate; fleshy. Anthers 3; 0.3-0.6 mm long.
    Fruits
    Caryopsis with adherent pericarp; fusiform; 0.6-3.1 mm long; light brown.
    Distribution
    North America: southwest USA and Mexico.
    Reference
    Eragrostideae. Peterson 1994.

    Distribution

    Native to:

    Arizona, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southwest

    Other Data

    Muhlenbergia pectinata Goodd. appears in other Kew resources:

    Bibliography

    First published in J. Washington Acad. Sci. 31: 505 (1941)

    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

    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