1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus macgregorii R.E.Brooks & J.J.N.Campb.

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

    [GB]
    Habit
    Perennial; caespitose. Culms erect, or geniculately ascending; 40-120 cm long. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface, or pubescent. Leaf-sheath auricles falcate; 2-3 mm long. Ligule an eciliate membrane; 0.4-0.9 mm long; purple; truncate. Leaf-blades drooping; 7-15 mm wide; dark green, or glaucous; pruinose. Leaf-blade surface glabrous, or pubescent; hairy adaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; erect; oblong; bilateral; 4-12 cm long; 25-40 mm wide. Rhachis flattened; 0.3 mm wide. Spikelet packing broadside to rhachis; lax; 4-5 spikelets per cm. Rhachis internodes clavate; 4-7 mm long. Rhachis internode tip clavate. Spikelets ascending; in pairs. Fertile spikelets sessile; 2(-3) in the cluster.
    Spikelets
    Spikelets comprising 2-3 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; dorsally compressed; 10-15 mm long; breaking up at maturity; disarticulating between fertile florets but the lowest falling with glumes attached.
    Fertile
    Spikelets comprising 2-3 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; dorsally compressed; 10-15 mm long; breaking up at maturity; disarticulating between fertile florets but the lowest falling with glumes attached.
    Glume
    Glumes collateral; deciduous; similar; shorter than spikelet. Lower glume lanceolate; gibbous; 8-16 mm long; 1 length of upper glume; coriaceous; without keels; (2-)4-5(-8) -veined. Lower glume surface smooth, or scabrous. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 10-25 mm long. Upper glume lanceolate; gibbous; 8-16 mm long; 1.2-1.5 length of adjacent fertile lemma; coriaceous; without keels; (2-)4-5(-8) -veined. Upper glume surface smooth, or scabrous. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 10-25 mm long.
    Florets
    Fertile lemma lanceolate to oblong; 6-12 mm long; coriaceous; 5-7 -veined. Lemma surface smooth, or scaberulous; glabrous, or pilose. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn (15-)20-30 mm long overall. Palea 6-10 mm long; 0.9-1 length of lemma. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 2-4 mm long.
    Distribution
    North America: eastern Canada, north-central USA, northeast USA, south-central USA, and southeast USA.
    Reference
    Triticeae. Campbell 2007.
    Diagnostic
    Racemes 9-18 noded.

    Distribution

    Native to:

    Alabama, Arkansas, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Masachusettes, Mississippi, Missouri, Nebraska, New Hampshire, New York, North Carolina, North Dakota, Nova Scotia, Ohio, Oklahoma, Ontario, Pennsylvania, Rhode I., South Dakota, Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin

    Elymus macgregorii R.E.Brooks & J.J.N.Campb. appears in other Kew resources:

    First published in J. Kentucky Acad. Sci. 61: 88 (2000)

    Accepted by

    • Bailey, C. & al. (2015). Guide to the Vascular Plants of Tennessee: 1-813. University of Tennessee press.
    • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Kew Backbone Distributions
    • USDA, NRCS (2005- continuously updated). Natural Resources Conservation Services Plant Database http://plants.usda.gov/cgi_bin/topics.cgi?earl=checklist.html.

    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