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

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

    [GB]
    Habit
    Annual. Culms erect, or geniculately ascending; robust; 10-40 cm long. Culm-internodes antrorsely scabrous. Lateral branches ample. Leaf-sheaths smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 2-3 mm long; lacerate; obtuse. Leaf-blades flat, or conduplicate; 1-5 cm long; 1-2 mm wide. Leaf-blade surface scabrous; rough abaxially; puberulous; hairy adaxially.
    Inflorescences
    Inflorescence a panicle. Panicle open; linear; 5-20 cm long. Primary panicle branches appressed. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels scaberulous.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 1-2 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex entire, or erose; obtuse. Upper glume oblong; 1-2 mm long; 0.2-0.33 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex entire, or erose; obtuse.
    Florets
    Fertile lemma lanceolate; 5-6 mm long; membranous; without keel; 3 -veined. Lemma midvein pubescent; hairy below. Lemma surface scaberulous; rough above. Lemma margins pubescent; hairy below. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 10-30 mm long overall. Palea 1 length of lemma; 2 -veined. Palea surface pubescent; hairy on back; hairy below. Palea apex with excurrent keel veins.
    Flowers
    Lodicules 2; cuneate; fleshy. Anthers 3; 0.3-0.9 mm long.
    Fruits
    Caryopsis with adherent pericarp; fusiform; 2-2.5 mm long; light brown.
    Cleistogene
    Cleistogenes present; in lower sheaths.
    Distribution
    North America: southwest USA and Mexico.
    Reference
    Eragrostideae. Gr Baja Cal 1994.

    Distribution

    Native to:

    Arizona, California, Mexico Northwest

    Muhlenbergia appressa Goodd. appears in other Kew resources:

    First published in J. Washington Acad. Sci. 31: 504 (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 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