1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis porteri A.Gray

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

    [GB]
    Habit
    Perennial. Rhizomes elongated. Culms erect; 60-120 cm long; 2-4 -noded. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath oral hairs pubescent. Ligule an eciliate membrane; 2-4 mm long. Leaf-blades spreading; 4-8 mm wide. Leaf-blade surface scaberulous.
    Inflorescences
    Inflorescence a panicle. Panicle open; linear; equilateral, or nodding; 10-15 cm long. Primary panicle branches appressed, or ascending; 2-5 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; 4-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 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 asperulous. Lower glume apex acute. Upper glume lanceolate; 4-6 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume surface asperulous. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 3.5-5.5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.2 way up back of lemma; geniculate; 3-5 mm long overall; not or scarcely exserted from spikelet; with a straight or slightly twisted column. Palea 1 length of lemma. Rhachilla extension pilose; with 3 mm long hairs.
    Flowers
    Lodicules 2. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    North America: northeast USA and southeast .
    Reference
    Aveneae. N Amer Fl 1994.

    Images

    Distribution

    Native to:

    Arkansas, Georgia, Illinois, Indiana, Kentucky, Maryland, Missouri, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia

    Calamagrostis porteri A.Gray appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    s.coll. [s.n.], Pennsylvania K000838371
    Porter, T.C. [s.n.], Pennsylvania K000838372
    Porter, T.C. [s.n.], Pennsylvania K000838370

    First published in Proc. Amer. Acad. Arts 6: 79 (1862)

    Accepted by

    • Werier, D. (2017). Catalogue of the Vascular plants of New York state Memoirs of the Torrey Botanical Club 27: 1-542. New York Botanical Garden.
    • 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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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