1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis autumnalis Koidz.

        This species is accepted, and its native range is Japan (Honshu: Izushichito, Kyushu).

    [GB]
    Habit
    Perennial; caespitose; clumped loosely. Rhizomes short. Culms geniculately ascending; 20-70 cm long; 0.7-1.2 mm diam.; 3-5 -noded. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface, or pilose. Leaf-sheath oral hairs ciliate. Leaf-sheath auricles erect. Ligule an eciliate membrane; 1-2 mm long. Leaf-blades 10-30 cm long; 3-10 mm wide; stiff; glaucous. Leaf-blade venation prominent. Leaf-blade surface smooth.
    Inflorescences
    Inflorescence a panicle. Panicle open; lanceolate; 5-15 cm long; 1-2 cm wide. Primary panicle branches 2-4 -nate; 2-3.5 cm long. Panicle branches smooth to scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3.5-5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 3.5-5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate.
    Florets
    Fertile lemma ovate; 3-4.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5-0.66 way up back of lemma; straight; 3-4 mm long overall; without a column.
    Flowers
    Lodicules 2. Anthers 3; 1.8-2 mm long. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp; 2-2.2 mm long. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    Asia-temperate: eastern Asia.
    Reference
    Aveneae. Koyama 1994.

    Distribution

    Calamagrostis autumnalis Koidz. appears in other Kew resources:

    First published in Bot. Mag. (Tokyo) 39: 18 (1925)

    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.
    • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.

    Literature

    Kew Backbone Distributions
    • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.

    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