1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis gayana (Steud.) Soreng

        This species is accepted, and its native range is Chile to W. Argentina.

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Rhizomes elongated. Culms 2-23 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 4-8 mm long; acute. Leaf-blades curved; elliptic; 0.4-1 mm wide.
    Inflorescences
    Inflorescence a panicle. Panicle spiciform; elliptic, or globose; 1-7 cm long. Panicle branches smooth, or scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scabrous.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.5 mm long. Floret callus bearded. Floret callus hairs 1 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.5 mm long. Floret callus bearded. Floret callus hairs 1 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.8-2.1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 2-2.6 mm long; membranous; without keel; 0-4 -veined. Lemma lateral veins obscure. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25-0.33 way up back of lemma; straight; 3.5-5.5 mm long overall. Palea keels scabrous; adorned above.
    Flowers
    Lodicules 2. Anthers 3; 0.5-0.7 mm long. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp; 1.4-2 mm long. Embryo 0.33 length of caryopsis. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    South America: southern South America.
    Reference
    Aveneae. Fl Pat 1995.

    Distribution

    Native to:

    Argentina Northwest, Argentina South, Chile Central, Chile South

    Calamagrostis gayana (Steud.) Soreng appears in other Kew resources:

    First published in Contr. U.S. Natl. Herb. 48: 203 (2003)

    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
    • 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.

    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