1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis tolucensis (Kunth) Trin. ex Steud.

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

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms erect; 20-40 cm long. Culm-internodes smooth. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades erect; involute; 20-30 cm long; 1-1.5 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; hirsute; hairy adaxially.
    Inflorescences
    Inflorescence a panicle. Panicle open; pyramidal; 10-15 cm long. Primary panicle branches spreading; 3-6 cm long. Panicle branches smooth. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33 length of lemma.
    Glume
    Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous; rough above. Lower glume apex acuminate. Upper glume lanceolate; 6 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous; rough above. Upper glume apex attenuate.
    Florets
    Fertile lemma lanceolate; 6 mm long; membranous; without keel; 5 -veined. Lemma surface puberulous; hairy above. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 6-7 mm long overall; clearly exserted from spikelet; with twisted column. Column of lemma awn hispidulous. Rhachilla extension 1.5 mm long; pilose; with 1-2 mm long hairs.
    Flowers
    Lodicules 2. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    North America: Mexico. South America: Mesoamericana.
    Reference
    Aveneae. N Amer Fl 1994.

    Distribution

    Native to:

    Guatemala, Mexico Central, Mexico Gulf, Mexico Southeast, Mexico Southwest

    Calamagrostis tolucensis (Kunth) Trin. ex Steud. appears in other Kew resources:

    First published in Nomencl. Bot., ed. 2, 1: 250 (1840)

    Accepted by

    • 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.
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.
    • Davidse, G. & al. (eds.) (1994). Flora Mesoamericana 6: 1-543. Universidad Nacional Autónoma de México, México, D.F.

    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.
    • 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

    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