Skip to main content
  1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis diffusa (Keng) Keng f.

        This species is accepted, and its native range is Nepal to S. Central China.

    [GB]
    Habit
    Perennial. Ligule an eciliate membrane.
    Inflorescences
    Inflorescence a panicle. Panicle open; elliptic; effuse; 30 cm long. Primary panicle branches 6 -nate; 7-15 cm long. Panicle branches capillary; smooth. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5-3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5-3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1 length of lemma.
    Glume
    Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 2.5-3 mm long; 1.4 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 1.7-2.2 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acuminate.
    Florets
    Fertile lemma oblong; 2-2.2 mm long; membranous; without keel; 5 -veined. Lemma apex entire; emarginate, or obtuse; muticous. Palea 0.75 length of lemma. Rhachilla extension 0.6 mm long; pilose; with 1-1.5 mm long hairs.
    Flowers
    Lodicules 2. Anthers 3; 0.6 mm long. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp; oblong; 1.5 mm long. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    Asia-temperate: China.
    Reference
    Aveneae. Keng 1995.

    Distribution

    Native to:

    Assam, China South-Central, East Himalaya, Nepal

    Synonyms

    Other Data

    Calamagrostis diffusa (Keng) Keng f. appears in other Kew resources:

    Bibliography

    First published in Bull. Bot. Res., Harbin 4(3): 195 (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

    • Paszko, B. & Soreng, R.J. (2013). Species delimination and name application in Deyeuxia abnormis, Agrostis zenkeri, A. pleiophylla and related taxa (Poaceae: Agrostidinae) Phytotaxa 111: 1-26.
    • 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