1. Family: Poaceae Barnhart
    1. Genus: Leymus Hochst.
      1. Leymus ruoqiangensis S.L.Lu & Y.H.Wu

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

    [GB]
    Habit
    Perennial; caespitose. Rhizomes elongated. Butt sheaths persistent and investing base of culm; with compacted dead sheaths, or fibrous dead sheaths. Culms erect; 30-70 cm long; 3-4 -noded. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface; outer margin glabrous, or hairy. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades filiform; involute; 1-2 mm wide; coriaceous; stiff. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; linear; bilateral; 4.5-14 cm long. Rhachis ciliate on margins. Spikelet packing broadside to rhachis; lax. Rhachis internodes linear; 6-15 mm long. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10-17 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pilose.
    Fertile
    Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10-17 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus pilose.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume linear; 7-10 mm long; 1 length of upper glume; coriaceous; 0-1 -veined. Lower glume lateral veins absent. Lower glume surface glabrous, or pilose. Lower glume apex acuminate. Upper glume linear; 7-10 mm long; 0.7-0.85 length of adjacent fertile lemma; coriaceous; without keels; 0-1 -veined. Upper glume primary vein absent, or obscure. Upper glume lateral veins absent. Upper glume margins scabrous. Upper glume apex acuminate.
    Florets
    Fertile lemma lanceolate, or oblong; 9-12 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface puberulous. Lemma apex acuminate; muticous. Palea 1 length of lemma; 2 -veined. Palea keels eciliate, or ciliolate. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 3-4 mm long; yellow, or purple.
    Distribution
    Asia-temperate: China.
    Reference
    Triticeae. Lu & Wu 1996.
    [GB]
    Habit
    Perennial; caespitose. Rhizomes elongated. Culms erect; 30-70 cm long; 2-4 -noded. Leaf-sheaths glabrous on surface; outer margin glabrous, or hairy. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades 10-20 cm long; 3 mm wide. Leaf-blade surface puberulous; hairy adaxially.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; linear; straight, or arcuate; bilateral; 4-10 cm long; 6-8 mm wide. Spikelet packing broadside to rhachis. Rhachis internodes linear; 5-7(-15) mm long. Spikelets solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10-17 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.2 mm long; pubescent.
    Fertile
    Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10-17 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.2 mm long; pubescent.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume linear, or lanceolate; 7-10 mm long; 1 length of upper glume; coriaceous; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth, or scabrous; rough above. Lower glume apex setaceously attenuate. Upper glume linear, or lanceolate; 7-10 mm long; 0.7-0.85 length of adjacent fertile lemma; coriaceous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume margins smooth, or scabrous. Upper glume apex setaceously attenuate.
    Florets
    Fertile lemma lanceolate; 9-12 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma margins eciliate, or ciliate. Lemma apex acuminate; muticous. Palea 1 length of lemma; 2 -veined. Palea surface pilose; hairy on back. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 4 mm long; yellow.
    Distribution
    Asia-temperate: China.
    Reference
    Triticeae. Fl China 2007.

    Distribution

    Native to:

    Qinghai, Xinjiang

    Leymus ruoqiangensis S.L.Lu & Y.H.Wu appears in other Kew resources:

    First published in Bull. Bot. Res., Harbin 12: 343 (1992)

    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