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

        This species is accepted, and its native range is S. Mexico to Honduras, Ecuador.

    [GB]
    Habit
    Perennial. Culms decumbent, or rambling; 40-100 cm long; rooting from lower nodes. Culm-internodes terete; distally pubescent. Culm-nodes constricted; purple; pubescent. Leaf-sheaths pilose; with simple hairs; outer margin hairy. Ligule a ciliate membrane; 0.6-1 mm long. Collar pubescent. Leaf-blade base broadly rounded, or cordate. Leaf-blades lanceolate; 5-12 cm long; 4-14 mm wide. Leaf-blade surface glabrous, or pubescent; hairy adaxially. Leaf-blade margins ciliate; hairy at base. Leaf-blade apex acuminate.
    Inflorescences
    Inflorescence a panicle. Peduncle 20 cm long; pubescent above. Panicle open; ovate; effuse; 4-12 cm long; 3.5-10 cm wide. Panicle axis pubescent. Panicle branches scabrous; pubescent in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; 2.4-2.8 mm long; 1-1.1 mm wide; falling entire.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; 2.4-2.8 mm long; 1-1.1 mm wide; falling entire.
    Glume
    Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; not clasping; 1.2-1.4 mm long; 0.33-0.5 length of spikelet; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex truncate. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 7-9 -veined. Upper glume surface glabrous, or puberulous. Upper glume apex acute.
    Florets
    Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 7 -veined; glabrous, or puberulous; acute. Palea of lower sterile floret 1.5 mm long. Fertile lemma elliptic; dorsally compressed; 2.4-2.5 mm long; 0.9-1.1 mm wide; indurate; pallid; shiny; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex apiculate; with a little green crest and pubescent. Palea involute; indurate.
    Fruits
    Caryopsis with adherent pericarp; ellipsoid; 1.6 mm long. Embryo 0.5 length of caryopsis. Hilum punctiform.
    Distribution
    South America: Mesoamericana.
    Reference
    Paniceae. Zuloaga 1994.

    Distribution

    Native to:

    Ecuador, El Salvador, Guatemala, Honduras, Mexico Southwest

    Panicum umbonulatum Swallen appears in other Kew resources:

    First published in Contr. U.S. Natl. Herb. 29: 420 (1950)

    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.
    • Jørgensen, P.M. & León-Yánez, S. (eds.) (1999). Catalogue of the Vascular Plants of Ecuador Monographs in Systematic Botany from the Missouri Botanical Garden 75: i-viii, 1-1181.

    Literature

    Kew Backbone Distributions
    • 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.
    • Jørgensen, P.M. & León-Yánez, S. (eds.) (1999). Catalogue of the Vascular Plants of Ecuador Monographs in Systematic Botany from the Missouri Botanical Garden 75: i-viii, 1-1181.
    • 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

    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