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  1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis vulcanica Swallen

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

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms erect; 40-80 cm long. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades curved; aciculate; convolute; 20-40 cm long; 2-3 mm wide; coriaceous; stiff. Leaf-blade surface ribbed; smooth, or scaberulous; rough abaxially; pilose; hairy adaxially.
    Inflorescences
    Inflorescence a panicle. Panicle open; pyramidal; 8-14 cm long. Primary panicle branches spreading, or reflexed; 3-7 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2 mm long; 0.4 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2 mm long; 0.4 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 3-5 -veined. Lower glume apex acuminate. Upper glume lanceolate; 6-7 mm long; 1.2-1.4 length of adjacent fertile lemma; membranous; 1-keeled; 3-5 -veined. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 5 mm long; membranous; much thinner above; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface scabrous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 10 mm long overall; clearly exserted from spikelet; with twisted column. Column of lemma awn puberulous. Rhachilla extension 2 mm long; pilose; with 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. Swallen 1994.

    Distribution

    Native to:

    Guatemala, Mexico Southeast

    Other Data

    Calamagrostis vulcanica Swallen appears in other Kew resources:

    Bibliography

    First published in Phytologia 4: 424 (1953)

    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.
    • 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