1. Family: Poaceae Barnhart
    1. Genus: Triplasis P.Beauv.
      1. Triplasis purpurea (Walter) Chapm.

        This species is accepted, and its native range is SE. Canada, U.S.A., SE. Mexico to Central America.

    [GB]
    Habit
    Annual; caespitose. Culms geniculately ascending; 60-75 cm long; disarticulating at the nodes. Leaves cauline. Leaf-sheaths longer than adjacent culm internode. Ligule a fringe of hairs; 0.5-1 mm long. Leaf-blades 10-15 cm long; 2-4 mm wide. Leaf-blade midrib indistinct. Leaf-blade surface scabrous.
    Inflorescences
    Inflorescence a panicle; comprising 4-15 fertile spikelets. Panicle open; ovate; 2-7 cm long; bearing few spikelets. Primary panicle branches simple; 1-2 cm long; bearing 1-4 fertile spikelets on each lower branch. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 2-3 fertile florets; with a barren rhachilla extension. Spikelets linear; laterally compressed; 6-8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5 mm long; eventually visible between lemmas. Floret callus pubescent.
    Fertile
    Spikelets comprising 2-3 fertile florets; with a barren rhachilla extension. Spikelets linear; laterally compressed; 6-8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5 mm long; eventually visible between lemmas. Floret callus pubescent.
    Glume
    Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume linear; 2 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex dentate; 2 -fid. Upper glume lanceolate; 2.5-3 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex dentate; 2 -fid.
    Florets
    Fertile lemma oblong; 3.6 mm long; membranous; keeled; 3 -veined. Lemma midvein pubescent. Lemma lateral veins close to margins. Lemma margins pubescent. Lemma apex dentate; 2 -fid; mucronate, or awned; 1 -awned. Principal lemma awn from a sinus; 0.5 mm long overall; limb pubescent; glabrescent towards tip. Palea bowed outwards; 0.75 length of lemma. Palea keels pubescent and with a crest of hairs. Rhachilla extension 0.5 length of fertile floret.
    Flowers
    Anthers 3; 2 mm long.
    Fruits
    Caryopsis with adherent pericarp; ellipsoid; laterally compressed; plano-convex; dark brown. Embryo projecting below grain.
    Cleistogene
    Cleistogenes present; in lower sheaths.
    Distribution
    North America: eastern Canada, northwest USA, north-central USA, northeast USA, south-central USA, and southeast USA. South America: Mesoamericana.
    Reference
    Eragrostideae. Pohl.

    Images

    Distribution

    Native to:

    Alabama, Arkansas, Colorado, Connecticut, Costa Rica, Delaware, Florida, Georgia, Honduras, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Masachusettes, Mexico Southeast, Michigan, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Virginia, Wisconsin

    Triplasis purpurea (Walter) Chapm. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Pohl, R.W. [11080], Costa Rica K000308730 Unknown type material
    Drummond, T. [330], Texas K000899863
    Chapman, A.W. [s.n.], USA K000899864
    Torrey, J. [s.n.], USA K000899862
    Nuttall, T. [s.n.], New Jersey K000899860
    Nuttall, T. [s.n.], New Jersey K000899861

    First published in Fl. South. U.S.: 560 (1860)

    Accepted by

    • Nelson Sutherland, C.H. (2008). Catálogo de las plantes vasculares de Honduras. Espermatofitas: 1-1576. SERNA/Guaymuras, Tegucigalpa, Honduras.
    • 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.
    • 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 2020. 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 2020. 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