1. Family: Poaceae Barnhart
    1. Genus: Aristida L.
      1. Aristida laxa Cav.

        This species is accepted, and its native range is Mexico to NW. Argentina.

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with curly dead sheaths. Culms 50-100 cm long; 1-1.5 mm diam. Culm-internodes solid; distally glabrous. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths keeled; glabrous on surface. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades involute; 15-30 cm long; 1-2.5 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially; glabrous; hairless except near base.
    Inflorescences
    Inflorescence a panicle. Panicle open; pyramidal; 25-45 cm long. Primary panicle branches ascending; 1 -nate; 4-8 cm long. Panicle axis scaberulous. Panicle branches scaberulous. Spikelets appressed; solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 10-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pubescent; acute. Floret callus hairs 1-1.5 mm long.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 10-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5 mm long; pubescent; acute. Floret callus hairs 1-1.5 mm long.
    Glume
    Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume linear; 9.5-11.5 mm long; 0.9 length of upper glume; membranous. Lower glume surface scabrous. Lower glume apex acute. Upper glume linear; 10-12 mm long; 1 length of adjacent fertile lemma; membranous. Upper glume surface smooth. Upper glume apex acute.
    Florets
    Fertile lemma linear; subterete; 10-12 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 3-branched; spreading; with 24-30 mm long limb; with a straight or slightly twisted column. Column of lemma awn 5-9 mm long. Lateral lemma awns shorter than principal.
    Flowers
    Anthers 3; 1.6 mm long.
    Distribution
    North America: Mexico. South America: Mesoamericana and western South America.
    Reference
    Aristideae. Fl Costaric 1993.
    [CPLC]

    Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

    Distribution
    Nativa en Colombia; Alt. 1000 - 3000 m.; Andes.
    Habit
    Hierba
    Conservation
    No Evaluada

    Distribution

    Native to:

    Argentina Northwest, Colombia, Costa Rica, Ecuador, Guatemala, Honduras, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southwest, Nicaragua, Peru, Venezuela

    Aristida laxa Cav. appears in other Kew resources:

    First published in Icon. 5: 44 (1799)

    Accepted by

    • Giraldo-Cañas, D. (2011). Catálogo de la familia Poaceae en Colombia Darwiniana 49: 139-247.
    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • Nelson Sutherland, C.H. (2008). Catálogo de las plantes vasculares de Honduras. Espermatofitas: 1-1576. SERNA/Guaymuras, Tegucigalpa, Honduras.
    • 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.
    • Stevens, W.D., Ulloa U., C., Pool, A. & Montiel, O.M. (2001). Flora de Nicaragua Monographs in Systematic Botany from the Missouri Botanical Garden 85: i-xlii, 1-2666.
    • Jørgensen, P.M. & León-Yánez, S. (eds.) (1999). Catalogue of the Vascular Plants of Ecuador Monographs in Systematic Botany from the Missouri Botanical Garden 75: i-viii, 1-1181.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.
    • Brako, L. & Zarucchi, J.L. (1993). Catalogue of the Flowering Plants and Gymnosperms of Peru Monographs in Systematic Botany from the Missouri Botanical Garden 45: i-xl, 1-1286.

    Literature

    Kew Backbone Distributions
    • Giraldo-Cañas, D. (2011). Catálogo de la familia Poaceae en Colombia Darwiniana 49: 139-247.
    • 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.
    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • 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.
    • Stevens, W.D., Ulloa U., C., Pool, A. & Montiel, O.M. (2001). Flora de Nicaragua Monographs in Systematic Botany from the Missouri Botanical Garden 85: i-xlii, 1-2666.
    • Jørgensen, P.M. & León-Yánez, S. (eds.) (1999). Catalogue of the Vascular Plants of Ecuador Monographs in Systematic Botany from the Missouri Botanical Garden 75: i-viii, 1-1181.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.
    • Brako, L. & Zarucchi, J.L. (1993). Catalogue of the Flowering Plants and Gymnosperms of Peru Monographs in Systematic Botany from the Missouri Botanical Garden 45: i-xl, 1-1286.

    Sources

    Catálogo de Plantas y Líquenes de Colombia
    http://creativecommons.org/licenses/by-nc-sa/3.0

    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