Skip to main content
  1. Family: Poaceae Barnhart
    1. Genus: Urochloa P.Beauv.
      1. Urochloa arizonica (Scribn. & Merr.) Morrone & Zuloaga

        This species is accepted, and its native range is S. U.S.A. to Mexico.

    [GB]
    Habit
    Annual; caespitose. Culms geniculately ascending, or decumbent; 15-60 cm long. Culm-nodes glabrous, or bearded. Lateral branches ample. Leaf-sheaths glabrous on surface, or hispid; with tubercle-based hairs. Ligule a ciliate membrane; 0.5-1 mm long. Leaf-blade base broadly rounded; asymmetrical. Leaf-blades lanceolate; 5-18 cm long; 3-10 mm wide. Leaf-blade surface glabrous, or hispid; sparsely hairy; hairy abaxially. Leaf-blade margins tuberculate-ciliate; hairy at base.
    Inflorescences
    Inflorescence composed of racemes. Peduncle pubescent above. Racemes 4-6; borne along a central axis; unilateral; 1.5-3 cm long. Central inflorescence axis 7-15 cm long. Rhachis wingless; angular; pilose on surface. Spikelet packing adaxial; lax; irregular. Spikelets solitary, or in pairs. Fertile spikelets pedicelled. Pedicels linear; 1 mm long.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; compressed slightly; acute; 3.3-4 mm long; falling entire. Spikelet callus square; incorporating lowest rhachilla internode with adnate lower glume; 0.3 mm long.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; compressed slightly; acute; 3.3-4 mm long; falling entire. Spikelet callus square; incorporating lowest rhachilla internode with adnate lower glume; 0.3 mm long.
    Glume
    Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 0.25-0.5 length of spikelet; membranous; without keels; 5 -veined. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume apex acute.
    Florets
    Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5 -veined; pubescent; acute. Fertile lemma elliptic; 3 mm long; indurate; without keel. Lemma surface rugulose. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate; without keels. Palea surface rugose.
    Distribution
    North America: southwest USA, south-central USA, and Mexico.
    Reference
    Paniceae. Gr Texas.

    Images

    Distribution

    Native to:

    Alabama, Arizona, California, Florida, Mexico Northeast, Mexico Northwest, Mexico Southwest, Mississippi, New Mexico, Texas

    Synonyms

    Other Data

    Urochloa arizonica (Scribn. & Merr.) Morrone & Zuloaga appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Hinton, G.B. [6309a], Guerrero K000476058
    Hinton, G.B. [6285], Guerrero K000476059
    Pringle, C.G. [s.n.], Arizona Brachiaria arizonica K000958870
    Pringle, C.G. [465], Arizona Brachiaria arizonica K000958871

    Bibliography

    First published in Darwiniana 32: 61 (1993)

    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 Brachiaria arizonica.]

    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.

    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