1. Family: Poaceae Barnhart
    1. Genus: Anthoxanthum L.
      1. Anthoxanthum mexicanum (Rupr. ex E.Fourn.) Mez

        This species is accepted, and its native range is Mexico (Puebla, Oaxaca, Chiapas) to Guatemala, Venezuela.

    [GB]
    Habit
    Perennial; caespitose. Culms geniculately ascending; 40-70 cm long. Lateral branches lacking. Ligule an eciliate membrane. Leaf-blades 5-15 cm long; 2-4 mm wide. Leaf-blade apex abruptly acute.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear, or lanceolate; interrupted; 6-12 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels ciliate.
    Spikelets
    Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.2 mm long.
    Fertile
    Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.2 mm long.
    Glume
    Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 3.5-4 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 5-6 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface asperulous. Upper glume apex acute.
    Florets
    Basal sterile florets dissimilar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret oblong; 5 mm long; chartaceous; without keels; 5 -veined; pubescent; bearing tawny hairs; dentate; 2 -fid; obtuse; awned. Awn of lower sterile floret dorsal; arising 0.75 way up back of lemma; 1-1.5 mm long. Lemma of upper sterile floret oblong; 5 mm long; chartaceous; pubescent; dentate; 2 -fid; obtuse; awned. Awn of upper sterile floret dorsal; arising 0.25 way up back of lemma; geniculate; 6-7 mm long. Fertile lemma oblong; 2.5 mm long; cartilaginous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma margins convolute; covering most of palea. Lemma apex obtuse. Palea oblong; 1 -veined; without keels.
    Flowers
    Lodicules absent. Anthers 2. Stigmas 2; protogynous; pubescent.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform.
    Distribution
    North America: Mexico. South America: Mesoamericana and northern South America.
    Reference
    Aveneae. WDC 1994.

    Images

    Distribution

    Native to:

    Guatemala, Mexico Central, Mexico Southeast, Mexico Southwest, Venezuela

    Anthoxanthum mexicanum (Rupr. ex E.Fourn.) Mez appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Galeotti, H.G. [[756]], Mexico Hierochloe mexicana K000308358

    First published in Repert. Spec. Nov. Regni Veg. 17: 291 (1921)

    Not 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. [Cited as Hierochloe mexicana.]

    Literature

    Kew Backbone Distributions
    • Tropicos.org (2009- continuously updated). Tropicos.org. Missouri Botanical Garden http://www.tropicos.org/.
    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • 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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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