1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis expansa (Munro ex Hillebr.) Hitchc.

        This species is accepted, and its native range is Hawaiian Islands.

    [GB]
    Habit
    Perennial. Culms geniculately ascending; 50-60 cm long. Lateral branches lacking. Leaf-sheaths retrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 1-2 mm long. Leaf-blades flat, or involute; 15-20 cm long; 5-10 mm wide; 2-4 cm long at summit of culm. Leaf-blade surface scabrous; rough adaxially. Leaf-blade apex hardened.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; oblong; 8-15 cm long. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 4-5 mm long; 0.5-0.6 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 4-5 mm long; 0.5-0.6 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 7 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 7 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.
    Florets
    Fertile lemma oblong; 3-4 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; curved; 5 mm long overall. Palea 2.5-3 mm long; hyaline; 2 -veined. Palea keels scaberulous. Rhachilla extension 0.5-2 mm long; pilose.
    Flowers
    Lodicules 2. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform.
    Distribution
    Pacific: north-central.
    Reference
    Aveneae. Hitchcock 1993.

    Images

    Distribution

    Calamagrostis expansa (Munro ex Hillebr.) Hitchc. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    s.coll. [s.n.], Hawaii K000838377 Unknown type material

    First published in Mem. Bernice Pauahi Bishop Mus. 8: 149 (1922)

    Accepted by

    • Clayton, W.D. & Snow, N. (2010). A key to Pacific Grasses: 1-107. Kew Publishing, Royal Botanic Gardens, Kew.
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Kew Backbone Distributions
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. 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