1. Family: Poaceae Barnhart
    1. Genus: Aristida L.
      1. Aristida dichotoma Michx.

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

    [GB]
    Habit
    Annual. Culms zigzag; 15-75 cm long; wiry. Lateral branches ample; arising from mid culm and upper culm. Leaf-sheaths without keel; glabrous on surface. Ligule a fringe of hairs; 0.2-0.3 mm long. Leaf-blades filiform; 8-15 cm long; 1-2 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; 4-15 cm long. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 4-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pubescent; obtuse.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 4-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pubescent; obtuse.
    Glume
    Glumes similar; reaching apex of florets, or exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 4-10 mm long; 1 length of upper glume; membranous; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or setaceously attenuate. Upper glume lanceolate; 4-10 mm long; 1-1.6 length of adjacent fertile lemma; membranous; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or setaceously attenuate.
    Florets
    Fertile lemma linear; subterete; 4-6 mm long; coriaceous; yellow and purple; mottled with last colour; without keel; 3 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex awned; 3 -awned. Principal lemma awn 3-branched; spreading and briefly coiled at base of limb; with 5-9 mm long limb; without a column. Lateral lemma awns spreading less than principal; 1-2 mm long; shorter than principal.
    Flowers
    Anthers 3.
    Distribution
    North America: eastern Canada, northwest USA, north-central USA, northeast USA, south-central USA, and southeast USA.
    Reference
    Aristideae. Gr Tex 1993.

    Distribution

    Native to:

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

    Introduced into:

    California

    Aristida dichotoma Michx. appears in other Kew resources:

    First published in Fl. Bor.-Amer. 1: 41 (1803)

    Accepted by

    • Ackerfield, J. (2015). Flora of Colorado: 1-818. BRIT Press.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.

    Literature

    Kew Backbone Distributions
    • Ackerfield, J. (2015). Flora of Colorado: 1-818. BRIT Press.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. 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