1. Family: Poaceae Barnhart
    1. Genus: Arctopoa (Griseb.) Prob.
      1. Arctopoa eminens (J.Presl) Prob.

        This species is accepted, and its native range is Russian Far East to Japan, Aleutian Islands to Canada.

    [GB]
    Habit
    Perennial; culms solitary. Rhizomes elongated. Culms erect; robust; 50-130 cm long; 3-6 mm diam. Culm-internodes terete; smooth. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 1.2-3 mm long. Leaf-blades 10-25 cm long; 4-11 mm wide. Leaf-blade apex abruptly acute.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; elliptic; 9-24 cm long. Primary panicle branches ascending; bearing spikelets almost to the base. Panicle branches stiff. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 2-6 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 7-11.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.
    Fertile
    Spikelets comprising 2-6 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 7-11.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume elliptic; 5-6 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume elliptic; 7-8 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.
    Florets
    Fertile lemma elliptic; oblong in profile; 7-8 mm long; membranous; keeled; 5 -veined. Lemma midvein ciliate. Lemma surface puberulous to pilose. Lemma margins ciliate. Lemma apex acute. Palea 1 length of lemma. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3; 2.3-4 mm long.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform.
    Distribution
    Asia-temperate: Soviet far east and eastern Asia. North America: Subarctic, western Canada, and eastern Canada.
    Reference
    Poeae. Fl Alaska 1994.

    Images

    Distribution

    Native to:

    Alaska, Aleutian Is., British Columbia, Japan, Kamchatka, Khabarovsk, Kuril Is., Labrador, Magadan, Newfoundland, Ontario, Primorye, Québec, Sakhalin

    Arctopoa eminens (J.Presl) Prob. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Kamchatka Poa eminens K000633891
    Kamchatka Poa eminens K000633892
    Kunth [218], Kamchatka Poa eminens K000633893
    Benth., H. [s.n.], Kamchatka Poa eminens K000633894

    First published in Novosti Sist. Vyssh. Rast. 11: 50 (1974)

    Not 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. [Cited as Poa eminens.]

    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.
    • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.
    • 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.
    • Hultén, E.O.G. (1960). Flora of the Aleutian Islands and westernmost Alaska Peninsula: with notes on the flora of Commander Islands, ed. 2: 1-376. Weinheim : J. Cramer ; New York : Hafner Pub. Co.

    Sources

    GrassBase - The Online World Grass Flora
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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