1. Family: Poaceae Barnhart
    1. Genus: Aristida L.
      1. Aristida petersonii Allred & Valdés-Reyna

        This species is accepted, and its native range is Mexico (Oaxaca).

    [GB]
    Habit
    Perennial; caespitose. Culms erect; 50-100 cm long. Culm-internodes terete; striate; distally glabrous. Lateral branches lacking. Leaf-sheaths mostly shorter than adjacent culm internode; without keel; striately veined; woolly. Ligule a fringe of hairs; 0.3-0.5 mm long. Leaf-blades flat, or conduplicate; 15-30 cm long; 2-2.5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins cartilaginous.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; 20-30 cm long. Primary panicle branches appressed; 1-2 -nate; 6-12 cm long; bearing 4-8 fertile spikelets on each lower branch. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 9-13 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 5 mm long; pubescent.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 9-13 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 5 mm long; pubescent.
    Glume
    Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 9-13 mm long; 1.5-2 length of upper glume; membranous; light brown, or purple; 1 -veined. Lower glume lateral veins absent. Upper glume lanceolate; 6-7 mm long; 1.7-2 length of adjacent fertile lemma; membranous; light brown, or purple; 1 -veined. Upper glume lateral veins absent. Upper glume apex acuminate.
    Florets
    Fertile lemma linear; subterete; 3-4 mm long; coriaceous; without keel; 3 -veined. Lemma surface glabrous. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned, or 3 -awned. Principal lemma awn geniculate, or 3-branched; with 7-9 mm long limb; with twisted column. Column of lemma awn 4-6 mm long. Lateral lemma awns 0.1 mm long; shorter than principal. Palea 1-1.5 mm long; hyaline; 2-keeled.
    Flowers
    Lodicules 2; 1-1.5 mm long. Anthers 3.
    Fruits
    Caryopsis with adherent pericarp; fusiform; 4.5-5.5 mm long; dark brown.
    Distribution
    North America: Mexico.
    Reference
    Aristideae. Allred et al 2004.

    Distribution

    Native to:

    Mexico Southwest

    Aristida petersonii Allred & Valdés-Reyna appears in other Kew resources:

    First published in Novon 5: 209 (1995)

    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.

    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.

    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