1. Family: Lamiaceae Martinov
    1. Pycnanthemum Michx.

      1. This genus is accepted, and its native range is N. America.

    [LKGF]

    Harley, R.M. et al. (2004). Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Springer-Verlag, Berlin, Heidelberg, New York.

    Habit
    Rhizomatous perennial herbs, strongly aromatic, with simple hairs
    Leaves
    Leaves sessile or short-petiolate, ovate to lanceolate, elliptical or linear, variously toothed or entire
    Inflorescences
    Inflorescence of verticillasters, or capitate, or corymbiform, composed of compact or loose, terminal and upper-axillary glomerules (paired cymes)
    Calyx
    Calyx actinomorphic to zygomorphic, not accrescent, cylindrical to tubular-campanulate, 10-13-nerved, 5-lobed, lobes triangular to ovate, lanceolate or aristate, all similar or anterior 2 more deeply cleft than posterior 3, throat glabrous
    Corolla
    Corolla usually white to lavender with purple spots, 2-lipped, posterior lip entire or emarginate, anterior lip 3-lobed, tube ± straight
    Stamens
    Stamens 4, didynamous or subequal, exserted or included, filaments glabrous, thecae parallel, separate at dehiscence
    Stigma
    Stigma-lobes unequal to subequal (rarely equal)
    Disc
    Disc symmetrical
    Fruits
    Nutlets ovoid to obloid, ± trigonal, smooth or rugose, glabrous or pubescent.
    Note
    2n = 36, 38, 40, 72, 76, 78, 80, c. 108, 120 (x = 18, 19, 20).  Seventeen to 21 species
    Distribution
    Southeastern Canada, Eastern and central United States, one disjunct species in California; centre of diversity in Southeastern U.S.
    Ecology
    Most species occur in disturbed sites, naturally open habitats or forest edges.

    Images

    Distribution

    Native to:

    Alabama, Arkansas, California, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Masachusettes, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Ontario, Pennsylvania, Québec, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin

    Pycnanthemum Michx. appears in other Kew resources:

    First published in Fl. Bor.-Amer. 2: 7 (1803)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Lamiaceae Key Genus Fact Sheets
    • Harley RM, Atkins S, Budantsev AL, Cantino PD, Conn BJ, Grayer R, Harley MM, de Kok RPJ, Krestovskaja T, Morales R, Paton AJ, Ryding O, and Upson T. 2004. Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Sp
    • Grant & Epling, Univ. Calif. Publ. Bot. 20: 195-240 (1943), rev.
    • Pycnanthes Raf., New Fl. 4: 95 (1838).
    • Tullia Leavenw., Amer. J. Sci. Arts 20: 343 (1830).
    • Brachystemum Michx., Fl. Bor.-Amer. 2: 5 (1803).
    • Pycnanthemum Michx., Fl. Bor.-Amer. 2: 7 (1803), nom. cons
    • Koellia Moench, Methodus: 407 (1794).
    • Furera Adans., Fam. Pl. 2: 103 (1763).

    Sources

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. 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 2019. 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

    Lamiaceae Key Genus Fact Sheets
    Nina Davies, Gemma Bramley and Don Kirkup, Royal Botanic Gardens, Kew
    http://creativecommons.org/licenses/by/3.0