1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis cainii Hitchc.

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

    [GB]
    Habit
    Perennial. Culms erect; 30-40 cm long. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 1-2 mm long; erose, or lacerate; obtuse. Leaf-blades 5-35 cm long; 1-2 mm wide. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade apex attenuate.
    Inflorescences
    Inflorescence a panicle. Peduncle antrorsely scabrous above. Panicle open; ovate; 6-10 cm long. Primary panicle branches ascending, or spreading; whorled at most nodes; 1-2 cm long; bearing 1-3 fertile spikelets on each lower branch. Panicle axis scabrous. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; pubescent.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1 mm long; 0.25 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1 mm long; 0.25 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; 5-6 mm long; 1.2 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 mm long; membranous; without keel; 5 -veined. Lemma surface asperulous; rough above. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 4-5 mm long overall; not or scarcely exserted from spikelet; with a straight or slightly twisted column. Palea 0.9 length of lemma. Rhachilla extension 0.5 mm long; pilose; with 1-2 mm long hairs.
    Flowers
    Lodicules 2. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    North America: southeast USA.
    Reference
    Aveneae. N Amer Fl 1994.

    Distribution

    Native to:

    North Carolina, Tennessee

    Calamagrostis cainii Hitchc. appears in other Kew resources:

    First published in J. Washington Acad. Sci. 24: 480 (1934)

    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