1. Family: Poaceae Barnhart
    1. Genus: Calamagrostis Adans.
      1. Calamagrostis sesquiflora (Trin.) Tzvelev

        This species is accepted, and its native range is Russian Far East to N. Japan, Alaska to NW. U.S.A.

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms 15-40 cm long. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 3-6 mm long; scaberulous on abaxial surface; erose; obtuse. Collar glabrous. Leaf-blades erect; involute; 1.5-3 mm wide. Leaf-blade surface scaberulous; rough abaxially.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; linear, or lanceolate; interrupted; 4-12 cm long; 1.5-2 cm wide. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2-3 mm long; 0.33-0.5 length of lemma.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2-3 mm long; 0.33-0.5 length of lemma.
    Glume
    Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6-7 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1-3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.
    Florets
    Fertile lemma lanceolate; 6-7 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 8-10 mm long overall; with twisted column. Rhachilla extension villous.
    Flowers
    Lodicules 2; 0.8 mm long. Anthers 3; 2.5 mm long. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
    Distribution
    Asia-temperate: Soviet far east. North America: Subarctic.
    Reference
    Aveneae. Fl Pac NW 1994.

    Distribution

    Native to:

    Alaska, Aleutian Is., British Columbia, Japan, Kamchatka, Kuril Is., Magadan, Oregon, Sakhalin, Washington

    Calamagrostis sesquiflora (Trin.) Tzvelev appears in other Kew resources:

    First published in Fl. Arct. URSS 2: 74 (1964)

    Accepted by

    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Kharkevich, S.S., Probatova, N.S. & Novikov, V.S. (1985). Sosudistye rasteniia sovetskogo Dal’nego Vostoka 1: 1-383. Izd-vo "Nauka," Leningradskoe otd-nie, Leningrad.

    Literature

    Kew Backbone Distributions
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Kharkevich, S.S., Probatova, N.S. & Novikov, V.S. (1985). Sosudistye rasteniia sovetskogo Dal’nego Vostoka 1: 1-383. Izd-vo "Nauka," Leningradskoe otd-nie, Leningrad.

    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