1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus durus (Keng) S.L.Chen

        This species is accepted, and its native range is W. & Central China.

    [GB]
    Habit
    Perennial; caespitose. Basal innovations extravaginal. Culms erect; 60-90 cm long; 1.6-2.2 mm diam.; 3-4 -noded. Culm-internodes distally pruinose. Leaf-sheaths 15-21 cm long; smooth; glabrous on surface. Ligule an eciliate membrane, or absent; 0.2 mm long. Leaf-blades erect; flat, or involute; 5-15(-30) cm long; 2-5.5 mm wide. Leaf-blade surface scaberulous; rough adaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; bilateral; 5-8 cm long. Rhachis smooth on margins, or scaberulous on margins. Spikelet packing broadside to rhachis; 2 -rowed. Rhachis internodes 4-6 mm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-2 mm long.
    Spikelets
    Spikelets comprising 3-6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 13-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus base truncate. Floret callus pilose.
    Fertile
    Spikelets comprising 3-6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 13-16 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus base truncate. Floret callus pilose.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or elliptic; 3-4 mm long; 0.66 length of upper glume; coriaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume lanceolate, or elliptic; 5-6 mm long; 0.5 length of adjacent fertile lemma; coriaceous; without keels; 3 -veined. Upper glume lateral veins prominent. Upper glume apex acute, or acuminate.
    Florets
    Fertile lemma lanceolate to oblong; 11 mm long; coriaceous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 25-30 mm long overall. Palea 10 mm long. Palea keels scabrous. Palea surface puberulous. Palea apex obtuse. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3; 2 mm long. Stigmas 2. Ovary pubescent on apex.
    Fruits
    Caryopsis with adherent pericarp; oblong; 6 mm long; hairy at apex. Hilum linear.
    Distribution
    Asia-temperate: China.
    Reference
    Triticeae. Keng 1996.

    Distribution

    Native to:

    China North-Central, China South-Central, Qinghai, Tibet, Xinjiang

    Elymus durus (Keng) S.L.Chen appears in other Kew resources:

    First published in Fl. China 22: 412 (2006)

    Accepted by

    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.
    • Wu, Z. & Raven, P.H. (eds.) (2006). Poaceae Flora of China 22: 1-733. Missouri Botanical Garden Press, St. Louis.

    Literature

    Kew Backbone Distributions
    • Wu, Z. & Raven, P.H. (eds.) (2006). Poaceae Flora of China 22: 1-733. Missouri Botanical Garden Press, St. Louis.

    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