1. Family: Poaceae Barnhart
    1. Genus: Panicum L.
      1. Panicum diffusum Sw.

        This species is accepted, and its native range is Texas to W. Louisiana, Caribbean.

    [GB]
    Habit
    Perennial; caespitose. Culms geniculately ascending, or decumbent; slender; 20-100 cm long; wiry. Culm-nodes pubescent. Lateral branches ample. Leaf-sheaths glabrous on surface, or hirsute; with tubercle-based hairs; outer margin hairy. Ligule a fringe of hairs; 1.5-3 mm long. Leaf-blades 5-20 cm long; 1-4.5 mm wide; mid-green. Leaf-blade surface glabrous, or pilose; hairy on both sides.
    Inflorescences
    Inflorescence a panicle; terminal and axillary. Axillary inflorescences compact, or enclosed. Panicle open; pyramidal; 5-25 cm long; with spikelets clustered towards branch tips. Primary panicle branches ascending, or spreading. Panicle branches scabrous; glabrous in axils. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; acute; 2.1-2.7 mm long; 1 mm wide; falling entire.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; acute; 2.1-2.7 mm long; 1 mm wide; falling entire.
    Glume
    Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5 length of spikelet; membranous; without keels; 3 -veined. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex acute.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5 -veined; acute. Fertile lemma elliptic; dorsally compressed; 1.5-2 mm long; indurate; shiny; without keel. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.
    Distribution
    North America: south-central USA. South America: Caribbean and Brazil.
    Reference
    Paniceae. Gr Texas 1994.

    Distribution

    Native to:

    Bahamas, Cuba, Dominican Republic, Haiti, Jamaica, Leeward Is., Louisiana, Puerto Rico, Texas, Windward Is.

    Panicum diffusum Sw. appears in other Kew resources:

    First published in Prodr. Veg. Ind. Occ.: 23 (1788)

    Accepted by

    • Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies Smithsonian Contributions to Botany 98: 1-1192.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • 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
    • Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies Smithsonian Contributions to Botany 98: 1-1192.
    • 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 2019. 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 2019. 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