1. Family: Poaceae Barnhart
    1. Genus: Elymus L.
      1. Elymus tridentatus (C.Yen & J.L.Yang) S.L.Chen

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

    [GB]
    Habit
    Perennial; caespitose. Culms erect, or geniculately ascending; 42-65 cm long; 1.5-2 mm diam.; 2-3 -noded. Culm-internodes smooth; distally glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades involute; 5-7 cm long; 2 mm wide. Leaf-blade surface pubescent; hairy adaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; straight; bilateral; 5-11.5 cm long; 5 mm wide; bearing 6-14 fertile spikelets on each. Rhachis flattened; glabrous on surface. Spikelet packing broadside to rhachis. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 4-5 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 10-13 mm long; 2 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2 mm long; pubescent. Floret callus pubescent.
    Fertile
    Spikelets comprising 4-5 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 10-13 mm long; 2 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2 mm long; pubescent. Floret callus pubescent.
    Glume
    Glumes persistent; similar. Lower glume oblong; 4-5 mm long; coriaceous; without keels; 3 -veined. Lower glume surface smooth, or asperulous; rough on veins. Lower glume apex obtuse. Upper glume oblong; 5-6.5 mm long; coriaceous; without keels; 3 -veined. Upper glume surface smooth, or asperulous; rough on veins. Upper glume apex obtuse.
    Florets
    Fertile lemma oblong; 7-9 mm long; coriaceous; 5 -veined. Lemma surface pubescent; hairy below. Lemma margins pubescent. Lemma apex dentate; 3 -fid; with lobes 0.5-1 mm long; acuminate; muticous. Palea 1 length of lemma; 2 -veined. Palea keels ciliate; adorned above; with 0.33-0.5 of their length adorned. Palea surface scabrous. Palea apex truncate. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 2 mm long; black.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    Asia-temperate: China.
    Reference
    Triticeae. Fl China 2005.

    Distribution

    Native to:

    Qinghai

    Elymus tridentatus (C.Yen & J.L.Yang) S.L.Chen appears in other Kew resources:

    First published in Novon 7: 229 (1997)

    Accepted by

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