1. Family: Orchidaceae Juss.
    1. Genus: Cypripedium L.
      1. Cypripedium acaule Aiton

        This species is accepted, and its native range is Central & E. Canada to N. Central & E. U.S.A.

    [C-EM]
    Biology

    Flowering in April to June.

    Distribution

    Widespread in North America, most abundandy in the eastern and northeastern parts of its range. Canada (Newfoundland, Nova Scotia, New Brunswick, Prince Edward Island, Quebec, Ontario west to Saskatchewan and Alberta), U.S.A. (Ne,v England south to South Carolina, Georgia, Tennessee and Alabama and west to Minnesota, Ohio, Indiana, Kentucky).

    Ecology

    In a variety of habitats from wet sphagnum bog to dry Pinus (pine) forest, usually in moderate shade where the soil is rich in humus, strongly acidic and thoroughly aerated. Flowering in April to June.

    General Description

    A terrestrial herb 20-45 cm tall, with a very short erect underground stem, 1-7 cm long, covered by two to three glabrous tubular sheaths and growing from a short underground rhizome. Leaves nvo, plicate, basal, spreading-suberect, elliptic, 10-28 cm long, 5-15 cm wide, glandular-pubescent, ciliate, glossy bright green. Inflorescence one- or rarely two-flowered; peduncle erect, to 40 cm long, glandular-pubescent; bract arching over flower, foliaceous, lanceolate, acuminate, 4-5 cm long, 1-1.5 cm wide, glandular- pubescent. Flower large, nutant, with yellow-green to maroon sepals and petals and a pink or rarely white lip, the staminode green to pink; pedicel and ovary 1-1.5 cm long, glandular-pubescent. Dorsal sepal often arching over lip, ovate- to elliptic-lanceolate, acuminate, 3-5 cm long, 0.5-1.7 cm wide, glandular-ciliate on basal margins, sparsely glandular-pubescent without and within; synsepal elliptic- to ovate-lanceolate, acute to obtuse, 3-4.5 cm long, 1-2.3 cm wide, sparsely glandular-pubescent without, glandular-ciliate. Petals deflexed at 45°, slightly twisted, slightly falcate, linear-lanceolate to lanceolate, acute, 4-6 cm long, 1-1.7 cm wide, densely pubescent at the base within. Lip ellipsoid-obovoid, longer than the sepals, 4-6 cm long, 2.5-3.5 cm wide, densely pubescent on inner surface at base, pubescent on front margin and around mouth on outer surface, lacking discernable side lobes, the orifice elongate and narrow, the margins incurved except at the apex. Column 1-1.2 cm long, pubescent on dorsal surface; staminode convex, suborbicular- rhombic to ovoid-deltoid, obtuse to 1.8 cm long and 1.4 cm wide, densely pubescent.

    Images

    Distribution

    Native to:

    Alabama, Alberta, Connecticut, Delaware, District of Columbia, Georgia, Illinois, Indiana, Kentucky, Maine, Manitoba, Maryland, Masachusettes, Michigan, Minnesota, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Carolina, Northwest Territorie, Nova Scotia, Ohio, Ontario, Pennsylvania, Prince Edward I., Québec, Rhode I., Saskatchewan, South Carolina, Tennessee, Vermont, Virginia, West Virginia, Wisconsin

    Cypripedium acaule Aiton appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    57353.000
    5791.000
    72742.000
    Canada K000363699
    Schwarz, V.T., USA 45327.000
    Eaton, D.C. [s.n.], USA K000363695
    Eaton, D.C. [s.n.], Connecticut K000363696
    Fraser [53], USA Cypripedium humile K000363698
    Torrey [s.n.], New Jersey Cypripedium humile K000363697
    Gouldie [s.n.], Canada Cypripedium humile K000363738

    First published in Hort. Kew. 3: 303 (1789)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Herkert, J.R. & Ebinger, J.E. (eds.) (2002). Endangered and Threatened Species of Illinois: status and distribution 1: 1-161. Endangered species protection board, Springfield, Illinois.
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.

    Literature

    Cypripedioideae: e-monocot.org
    • Aiton, W. Original description of Cypripedium acaule. 3, (1789).

    Sources

    Cypripedioideae: e-monocot.org
    All Rights Reserved

    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 2018. 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 2018. 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