1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis coarctata Eaton

        This species is accepted, and its native range is E. U.S.A.

    [GB]
    Habit
    Perennial. Rhizomes elongated. Culms erect; 80-150 cm long. Culm-internodes antrorsely scabrous. Leaf-sheaths antrorsely scabrous; glabrous on surface, or hirsute. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 2-4 mm long; truncate. Leaf-blades 5-10 mm wide; glaucous. Leaf-blade surface glabrous, or hirsute; sparsely hairy.
    Inflorescences
    Inflorescence a panicle. Peduncle antrorsely scabrous above. Panicle contracted; linear; 8-20 cm long; 1-2 cm wide. Primary panicle branches 1-3 cm long. Panicle axis scabrous. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.66 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.66 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 lateral veins absent. Lower glume surface scabrous. Lower glume apex attenuate. Upper glume lanceolate; 6-7 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume surface scabrous. Upper glume apex attenuate.
    Florets
    Fertile lemma lanceolate; 5-6 mm long; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; straight; 1-2 mm long overall; not or scarcely exserted from spikelet. Rhachilla extension 1 mm long; pubescent.
    Flowers
    Lodicules 2. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    North America: northeast USA. South America: northern South America.
    Reference
    Aveneae. N Amer Fl 1994.

    Distribution

    Native to:

    Alabama, Connecticut, Delaware, District of Columbia, Georgia, Kentucky, Louisiana, Maine, Maryland, Masachusettes, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode I., South Carolina, Tennessee, Virginia, West Virginia

    Calamagrostis coarctata Eaton appears in other Kew resources:

    First published in Man. Bot., ed. 5: 144 (1829)

    Accepted by

    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • 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
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

    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