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

        This species is accepted, and its native range is Central & E. U.S.A. to Central America, Cuba to Hispaniola.

    [GB]
    Habit
    Perennial; mat forming. Culms 15-40 cm long. Culm-internodes distally glabrous. Culm-nodes bearded. Lateral branches lacking. Leaves heterophyllous with a basal winter rosette. Leaf-sheaths glabrous on surface, or hirsute; with simple hairs, or reflexed hairs; outer margin hairy. Ligule an eciliate membrane, or a ciliolate membrane. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 7-16 cm long; 3-10 mm wide; yellowish green. Leaf-blade surface glabrous, or pubescent; sparsely hairy. Leaf-blade margins ciliate.
    Inflorescences
    Inflorescence a panicle. Panicle open; pyramidal; loose; 7-12 cm long; bearing few spikelets. Panicle axis hirsute. Panicle branches hirsute. Spikelets spreading; solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; obtuse; 1.7-2.3 mm long; falling entire.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; dorsally compressed; obtuse; 1.7-2.3 mm long; falling entire.
    Glume
    Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5 mm long; 0.25-0.33 length of spikelet; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.7-2.3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume apex obtuse.
    Florets
    Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1.7-2.3 mm long; 1 length of spikelet; membranous; 5 -veined; pubescent; obtuse. Fertile lemma elliptic; dorsally compressed; 1.5-2 mm long; indurate; shiny; without keel. Lemma margins involute. Palea involute; indurate.
    Flowers
    Anthers 3.
    Distribution
    North America: northeast USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana and Caribbean.
    Reference
    Paniceae. Gr Texas 1997.

    Images

    Distribution

    Native to:

    Alabama, Arkansas, Costa Rica, Cuba, District of Columbia, Dominican Republic, El Salvador, Florida, Georgia, Guatemala, Haiti, Honduras, Illinois, Indiana, Kentucky, Louisiana, Maryland, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Nicaragua, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode I., South Carolina, Tennessee, Texas, Virginia, West Virginia

    Panicum laxiflorum Lam. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Nash, G. V. [239], Florida K000674414
    Bush, B. F. [745], Missouri K000674413

    First published in Encycl. 4: 748 (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.
    • Nelson Sutherland, C.H. (2008). Catálogo de las plantes vasculares de Honduras. Espermatofitas: 1-1576. SERNA/Guaymuras, Tegucigalpa, Honduras.
    • 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.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.

    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