1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus humidorum (Ohwi & Sakam.) Á.Löve

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

    [GB]
    Habit
    Perennial; caespitose; clumped loosely. Rhizomes short. Culms geniculately ascending; 40-90 cm long; 2-3 mm diam.; 4-7 -noded. Leaves basal and cauline. Leaf-sheaths outer margin glabrous. Ligule an eciliate membrane; 0.5-0.7 mm long; truncate. Leaf-blades 10-25 cm long; 3-8 mm wide; stiff. Leaf-blade surface scabrous; rough adaxially, or on both sides.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; bilateral; 8-20 cm long; 7-10 mm wide. Rhachis flattened. Spikelet packing broadside to rhachis. Rhachis internodes linear; 7-15 mm long. Rhachis internode tip flat. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 4-10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 13-22 mm long; 5-6 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1-2 mm long; pubescent. Floret callus pubescent.
    Fertile
    Spikelets comprising 4-10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 13-22 mm long; 5-6 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1-2 mm long; pubescent. Floret callus pubescent.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 5.5-7 mm long; 0.75-0.8 length of upper glume; coriaceous; without keels; 3-5 -veined. Lower glume apex acute. Upper glume lanceolate; 7-8.5 mm long; coriaceous; without keels; 5-7 -veined. Upper glume apex acute.
    Florets
    Fertile lemma oblong; 8-11 mm long; coriaceous; much thinner on margins; 5 -veined. Lemma lateral veins ribbed. Lemma margins pubescent; hairy below. Lemma apex acute; awned; 1 -awned. Principal lemma awn 12-30 mm long overall. Palea oblong; 1 length of lemma. Palea keels winged; narrowly winged; ciliate. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3. Stigmas 2. Ovary pubescent on apex.
    Fruits
    Caryopsis with adherent pericarp; oblong; 5-6 mm long; hairy at apex.
    Distribution
    Asia-temperate: eastern Asia.
    Reference
    Triticeae. Koyama 1994.

    Distribution

    Elymus humidorum (Ohwi & Sakam.) Á.Löve appears in other Kew resources:

    First published in Feddes Repert. 95: 457 (1984)

    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.

    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