1. Family: Poaceae Barnhart
    1. Genus: Panicum L.
      1. Panicum scoparium Lam.

        This species is accepted, and its native range is Central & E. U.S.A., Caribbean.

    [GB]
    Habit
    Perennial. Culms geniculately ascending; 80-150 cm long. Culm-internodes glandular (below nodes); distally pubescent. Culm-nodes pubescent. Lateral branches ample. Leaves basal and cauline; heterophyllous with a basal winter rosette. Leaf-sheaths pubescent. Ligule a fringe of hairs; 1-1.3 mm long. Leaf-blades lanceolate; 10-25 cm long; 8-18 mm wide; 13-30 mm wide in winter rosette. Leaf-blade venation distinct. Leaf-blade surface puberulous, or pubescent; hairy abaxially.
    Inflorescences
    Inflorescence a panicle; terminal and axillary. Panicle open; ovate; 8-20 cm long. Panicle branches glandular. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; with obtuse base; dorsally compressed; compressed slightly; subacute; 2.2-2.8 mm long; falling entire.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; with obtuse base; dorsally compressed; compressed slightly; subacute; 2.2-2.8 mm long; falling entire.
    Glume
    Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.25 length of spikelet; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 1 length of spikelet; membranous; without keels; 7 -veined. Upper glume surface glabrous, or puberulous. Upper glume apex obtuse.
    Florets
    Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; oblong; 1 length of spikelet; membranous; 7 -veined; glabrous, or puberulous; obtuse. Fertile lemma oblong, or ovate; dorsally compressed; 2.2-2.8 mm long; indurate; without keel. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    North America: north-central USA, northeast USA, south-central USA, and southeast USA. South America: Caribbean.
    Reference
    Paniceae. Gr Texas 1994.

    Distribution

    Native to:

    Alabama, Arkansas, Connecticut, Cuba, Delaware, District of Columbia, Dominican Republic, Florida, Georgia, Haiti, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Masachusettes, Michigan, Mississippi, Missouri, New Jersey, New York, North Carolina, Oklahoma, Pennsylvania, Puerto Rico, Rhode I., South Carolina, Tennessee, Texas, Virginia

    Panicum scoparium Lam. appears in other Kew resources:

    First published in Encycl. 4: 744 (1798)

    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.

    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