1. Family: Poaceae Barnhart
    1. Genus: Aristida L.
      1. Aristida havardii Vasey

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

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms erect; 15-40 cm long. Culm-internodes distally glabrous. Leaf-sheaths without keel; outer margin hairy. Leaf-sheath oral hairs pubescent. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades involute; 5-15 cm long; 0.5-1.5 mm wide.
    Inflorescences
    Inflorescence a panicle; deciduous as a whole. Panicle open; oblong; effuse; 6-18 cm long; 0.5 of culm length. Primary panicle branches spreading, or reflexed; 3-6 cm long. Panicle branches with prominent pulvini. Spikelets spreading; solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 8-13 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pilose; obtuse.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 8-13 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pilose; obtuse.
    Glume
    Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 8-13 mm long; 1 length of upper glume; membranous; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 8-13 mm long; 1.6-1.8 length of adjacent fertile lemma; membranous; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.
    Florets
    Fertile lemma linear; subterete; 5-7 mm long; coriaceous; without keel; 3 -veined. Lemma margins convolute; covering most of palea. Lemma apex awned; 3 -awned. Principal lemma awn 3-branched; with 8-22 mm long limb; with a straight or slightly twisted column. Column of lemma awn 2-5 mm long. Lateral lemma awns 8-22 mm long; subequal to principal.
    Flowers
    Anthers 3.
    Distribution
    North America: southwest USA, south-central USA, and Mexico. South America: Mesoamericana.
    Reference
    Aristideae. Gr Tex 1993.

    Distribution

    Native to:

    Arizona, Colorado, Guatemala, Kansas, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southwest, New Mexico, Oklahoma, Texas

    Aristida havardii Vasey appears in other Kew resources:

    First published in Bull. Torrey Bot. Club 13: 27 (1886)

    Accepted by

    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.

    Literature

    Kew Backbone Distributions
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.

    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