1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis alba (J.Presl) Steud.

        This species is accepted, and its native range is Peru, S. Brazil to NE. Argentina.

    [GB]
    Habit
    Perennial. Rhizomes elongated. Culms erect; 40-80 cm long. Ligule an eciliate membrane; 0.5-1 mm long; truncate. Leaf-blades 4-15 cm long; 3-6 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous.
    Inflorescences
    Inflorescence a panicle. Panicle open; linear; interrupted; dense; 14-25 cm long; 2-3 cm wide. Primary panicle branches appressed; bearing spikelets almost to the base. Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7.5-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.2 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7.5-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.2 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 7.5-10 mm long; 1.7-1.8 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex attenuate.
    Florets
    Fertile lemma lanceolate; 4.5-5.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scaberulous. Lemma apex obtuse, or acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75-0.85 way up back of lemma; straight; spreading; 4.5-6 mm long overall. Rhachilla extension 1.8-2.1 mm long; pilose; hairy above.
    Flowers
    Lodicules 2. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    South America: western South America, Brazil, and southern South America.
    Reference
    Aveneae. Tovar 1995.

    Distribution

    Native to:

    Argentina Northeast, Brazil South, Peru, Uruguay

    Calamagrostis alba (J.Presl) Steud. appears in other Kew resources:

    First published in Nomencl. Bot., ed. 2, 1: 249 (1840)

    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.
    • Brako, L. & Zarucchi, J.L. (1993). Catalogue of the Flowering Plants and Gymnosperms of Peru Monographs in Systematic Botany from the Missouri Botanical Garden 45: i-xl, 1-1286.

    Literature

    Kew Backbone Distributions
    • Forzza, R.C. & al. (2013). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.
    • Brako, L. & Zarucchi, J.L. (1993). Catalogue of the Flowering Plants and Gymnosperms of Peru Monographs in Systematic Botany from the Missouri Botanical Garden 45: i-xl, 1-1286.

    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 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