1. Family: Poaceae Barnhart
    1. Genus: Panicum L.
      1. Panicum rivale Swallen

        This species is accepted, and its native range is N. South America to N. Brazil.

    [GB]
    Habit
    Annual. Culms decumbent; 5-20 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Culm-nodes glabrous, or pubescent, or bearded. Leaf-sheaths mostly shorter than adjacent culm internode; striately veined; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 1 mm long. Leaf-blade base cordate. Leaf-blades lanceolate, or ovate; 16-28 cm long; 2-4 mm wide. Leaf-blade surface pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade apex acuminate.
    Inflorescences
    Inflorescence a panicle. Peduncle 2-6 cm long; glabrous. Panicle open; ovate; 3-8 cm long. Primary panicle branches spreading, or reflexed; distant. Panicle branches flexuous; eglandular. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; flexuous.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or obovate; dorsally compressed; 1.1-1.6 mm long; 0.5-0.6 mm wide; falling entire.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or obovate; dorsally compressed; 1.1-1.6 mm long; 0.5-0.6 mm wide; falling entire.
    Glume
    Glumes shorter than spikelet, or reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.7-0.8 mm long; 0.5-0.66 length of spikelet; membranous; without keels; 1-3 -veined. Lower glume lateral veins absent, or distinct; transversely connected at apex. Lower glume apex acute. Upper glume ovate; 0.9-1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume apex obtuse.
    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; puberulous; acute. Fertile lemma elliptic; dorsally compressed; 1-1.2 mm long; indurate; pallid; without keel. Lemma surface smooth. Lemma margins involute. Palea involute; indurate.
    Distribution
    South America: northern South America.
    Reference
    Paniceae. Fl Guiana 1995.

    Images

    Distribution

    Native to:

    Brazil North, French Guiana, Guyana, Suriname, Venezuela

    Panicum rivale Swallen appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1947 Maguire, B. [24732], Surinam K000309241 isotype

    First published in Bull. Torrey Bot. Club 75: 87 (1948)

    Accepted by

    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.

    Literature

    Kew Backbone Distributions
    • Forzza, R.C. & al. (2013). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.

    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 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