1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis muiriana B.L.Wilson & Sami Gray

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

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms 12-34 cm long. Leaf-sheaths glabrous on surface, or pilose; with reflexed hairs. Ligule an eciliate membrane; 0.8-2.2 mm long; obtuse. Leaf-blades involute; 4-12 cm long; 2-4 mm wide; glaucous. Leaf-blade venation comprising 5 vascular bundles. Leaf-blade surface scabrous; rough abaxially; pubescent; hairy adaxially. Leaf-blade apex acute.
    Inflorescences
    Inflorescence a panicle. Panicle open; ovate; 1.9-7.5 cm long; 0.4-3 cm wide; bearing few spikelets. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.3-0.6 mm long; 0.1 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.3-0.6 mm long; 0.1 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 3-4.5 mm long; 1 length of upper glume; membranous; purple; without keels, or 1-keeled. Lower glume apex acute; mucronate. Upper glume lanceolate; 3-4.5 mm long; 1.1 length of adjacent fertile lemma; membranous; purple; without keels, or 1-keeled; keeled above. Upper glume apex acute; mucronate.
    Florets
    Fertile lemma lanceolate; 2.5-4 mm long; membranous; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma surface smooth, or scaberulous. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.33-0.5 way up back of lemma; straight; 3.3-6 mm long overall; with twisted column. Palea 1 length of lemma. Rhachilla extension 2 mm long; pilose.
    Flowers
    Anthers 3; 0.9-2.5 mm long; purple.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    North America: southwest USA.
    Reference
    Aveneae. Wilson & Gray 2004.

    Distribution

    Native to:

    California

    Calamagrostis muiriana B.L.Wilson & Sami Gray appears in other Kew resources:

    First published in Madroño 49: 174 (2002)

    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.

    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