1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis coahuilensis P.M.Peterson, Soreng & Valde´s-Reyna

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

    [GB]
    Habit
    Perennial; caespitose. Butt sheaths persistent and investing base of culm; with compacted dead sheaths, or fibrous dead sheaths. Basal innovations extravaginal and intravaginal. Culms erect; (22-)40-100 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths 6-8 cm long; mostly shorter than adjacent culm internode; glabrous on surface. Ligule an eciliate membrane; 5-8 mm long; entire, or lacerate; truncate. Leaf-blades 8-20 cm long; 2-4 mm wide. Leaf-blade surface scabrous; rough adaxially; glabrous.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear; 9-20 cm long; 0.5-1.2 cm wide. Primary panicle branches appressed, or ascending; 1-2 -nate; 2-10 cm long; bearing spikelets almost to the base. Panicle axis scaberulous. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 0.6-4 mm long; scaberulous.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.8-7.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.8-1.8 mm long; 0.33-0.66 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.8-7.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.8-1.8 mm long; 0.33-0.66 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5.8-7.2 mm long; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 5-5.7 mm long; 1.1-1.2 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 5-5.7 mm long; membranous; without keel; 5 -veined. Lemma lateral veins prominent. Lemma surface scaberulous. Lemma apex entire, or dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0-0.15 way up back of lemma; geniculate; 8-10 mm long overall; with twisted column. Palea 1 length of lemma; 2 -veined. Palea keels scaberulous. Rhachilla extension 2.4-3 mm long; pilose; with 0.5-1 mm long hairs.
    Flowers
    Lodicules 2; lanceolate; 1 mm long; emarginate. Anthers 3; 1-1.2 mm long; purple. Stigmas 2. Ovary glabrous.
    Fruits
    Caryopsis with adherent pericarp; fusiform; 2-2.5 mm long; green. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    North America: Mexico.
    Reference
    Aveneae. Peterson et al 2006.

    Distribution

    Native to:

    Mexico Northeast

    Calamagrostis coahuilensis P.M.Peterson, Soreng & Valde´s-Reyna appears in other Kew resources:

    First published in Sida 21: 312 (2004)

    Accepted by

    • Soreng, R.J., Davidse, G., Peterson, P.M., Zuloaga, F.O., Judziewicz, E.J., Filgueiras, T.S. & Morrone, O. (eds.) (2005). Catalogue of New World Grasses project. TROPICOS,the Missouri Botanical Garden's on-line taxonomic database http://mobot.mobot.org/W3T/Search/nwgc.html.

    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