1. Family: Poaceae Barnhart
    1. Genus: Aristida L.
      1. Aristida vexativa Henrard

        This species is accepted, and its native range is Argentina (Santa Fé).

    [GB]
    Habit
    Perennial; caespitose. Culms erect; 15-30 cm long; 0.5 mm diam. Lateral branches lacking. Leaf-sheaths tight; striately veined; glabrous on surface. Leaf-sheath oral hairs pubescent, or ciliate. Ligule a fringe of hairs. Leaf-blades flexuous; conduplicate; 1 mm wide; glaucous. Leaf-blade surface scaberulous; rough adaxially, or on both sides. Leaf-blade margins unthickened. Leaf-blade apex attenuate.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; interrupted; 15 cm long. Primary panicle branches appressed; 2 -nate; 2-4 cm long. Panicle axis smooth, or scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 19-20 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 19-20 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent.
    Glume
    Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear; 9-10 mm long; 0.5 length of upper glume; membranous; 1 -veined. Lower glume primary vein ciliolate. Lower glume lateral veins absent. Lower glume apex awned; 1 -awned. Upper glume linear; 19-20 mm long; 2 length of adjacent fertile lemma; membranous; 1-3 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent, or obscure. Upper glume apex acuminate; awned; 1 -awned.
    Florets
    Fertile lemma linear; subterete; 8-11 mm long; coriaceous; without keel; 3 -veined. Lemma surface scabrous; rough above. Lemma margins convolute; covering most of palea. Lemma apex awned; 3 -awned. Principal lemma awn with 70 mm long limb. Lateral lemma awns 70 mm long; subequal to principal. Palea hyaline; 0 -veined.
    Flowers
    Lodicules 2. Anthers 3.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    South America: southern South America.
    Reference
    Aristideae. Henrard 1997.

    Distribution

    Native to:

    Argentina Northeast

    Aristida vexativa Henrard appears in other Kew resources:

    First published in Meded. Rijks-Herb. 54B: 669 (1928)

    Accepted by

    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.
    • 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
    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.

    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