1. Family: Poaceae Barnhart
    1. Genus: Metcalfia Conert
      1. Metcalfia mexicana (Scribn.) Conert

        This species is accepted, and its native range is Mexico.

    [GB]
    Habit
    Perennial; caespitose. Basal innovations intravaginal. Culms erect, or geniculately ascending; 70-90 cm long; 0.8-1 mm diam.; 2 -noded. Ligule an eciliate membrane; 2-4 mm long; lacerate. Leaf-blades convolute; 20-40 cm long; 1-2 mm wide. Leaf-blade apex acuminate; pungent.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; 12-16 cm long; 1 cm wide. Panicle branches angular; scabrous. Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels angular; unequal; 1.5-15 mm long; scabrous.
    Spikelets
    Spikelets comprising 3-4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 13-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy above. Floret callus evident; 1-1.2 mm long; pilose.
    Fertile
    Spikelets comprising 3-4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 13-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; hairy above. Floret callus evident; 1-1.2 mm long; pilose.
    Glume
    Glumes persistent; similar; reaching apex of florets. Lower glume lanceolate; 11-14 mm long; 0.9 length of upper glume; membranous; without keels; 7-9 -veined. Lower glume surface asperulous. Lower glume apex acute; awned; 1 -awned. Lower glume awn 1.2-1.6 mm long. Upper glume lanceolate; 12-15 mm long; 1.2-1.5 length of adjacent fertile lemma; membranous; without keels; 7-9 -veined. Upper glume surface asperulous; rough above. Upper glume awned; 1 -awned. Upper glume awn 1.2-1.6 mm long.
    Florets
    Fertile lemma ovate; 9-11 mm long; membranous; without keel; 7 -veined. Lemma surface pilose. Lemma hairs 0.6-1 mm long. Lemma apex lobed; 2 -fid; with lanceolate lobes; incised 0.25 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 12-15 mm long overall; with twisted column. Palea lanceolate; 0.75 length of lemma. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 3; 2-2.5 mm long; glabrous. Anthers 2; 1.5-2 mm long. Stigmas 2. Styles free to the base. Ovary pubescent all over.
    Fruits
    Hilum linear; 0.33 length of caryopsis.
    Distribution
    North America: Mexico.
    Reference
    Aveneae. WDC.

    Images

    Distribution

    Native to:

    Mexico Central, Mexico Northeast, Mexico Southwest

    Metcalfia mexicana (Scribn.) Conert appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Pringle, C.G. [3279], Mexico K000433968
    Pringle, C.G. [3279], Mexico K000433969

    First published in Willdenowia 2: 417 (1960)

    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

    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