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  1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis yanyuanensis J.L.Yang

        This species is accepted, and its native range is China (S. Sichuan, N. Yunnan).

    [GB]
    Habit
    Perennial. Rhizomes elongated. Culms erect; 40-60 cm long; 1 mm diam.; 2-3 -noded. Leaf-sheaths mostly shorter than adjacent culm internode; antrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 3 mm long; membranous. Leaf-blades convolute; 5-9.5 cm long; 1.5 mm wide. Leaf-blade surface scaberulous; glabrous.
    Inflorescences
    Inflorescence a panicle. Panicle open; ovate; 6-11 cm long. Primary panicle branches 5-6 -nate; 2.5 cm long. Panicle branches capillary; glabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; smooth.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3-3.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5 mm long; 0.2 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3-3.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5 mm long; 0.2 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface glabrous. Lower glume apex acute. Upper glume lanceolate; 3-3.7 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume surface glabrous. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 2.7-3.3 mm long; membranous; without keel; 5 -veined. Lemma apex entire; emarginate; pungent; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 2-6.5 mm long overall. Palea 1.5-2 mm long; 2 -veined. Palea apex dentate; 4 -fid. Rhachilla extension 1.5-2.5 mm long; villous; with 2-3 mm long hairs.
    Flowers
    Lodicules 2. Anthers 3.
    Fruits
    Caryopsis with adherent pericarp; ovoid; 1.7 mm long. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    Asia-temperate: China.
    Reference
    Aveneae. Yang 2003.

    Distribution

    Native to:

    China South-Central

    Synonyms

    Other Data

    Calamagrostis yanyuanensis J.L.Yang appears in other Kew resources:

    Bibliography

    First published in Acta Bot. Yunnan. 5: 48 (1983)

    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.

    Not accepted by

    • Nobis, M. & al. (2014). Contribution to the flora of Asian and European countries: new national and regional vascular plant records, 2 Acta Botanica Gallica 161: 209-221. [Cited as Deyeuxia yanyuanensis.]

    Literature

    Kew Backbone Distributions

    • Nobis, M. & al. (2014). Contribution to the flora of Asian and European countries: new national and regional vascular plant records, 2 Acta Botanica Gallica 161: 209-221.

    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