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

[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.

Morphology General Habit
Rhizomatous perennial herbs, strongly aromatic, with simple hairs
Morphology Leaves
Leaves sessile or short-petiolate, ovate to lanceolate, elliptical or linear, variously toothed or entire
Morphology Reproductive morphology Inflorescences
Inflorescence of verticillasters, or capitate, or corymbiform, composed of compact or loose, terminal and upper-axillary glomerules (paired cymes)
Morphology Reproductive morphology Flowers 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
Morphology Reproductive morphology Flowers Corolla
Corolla usually white to lavender with purple spots, 2-lipped, posterior lip entire or emarginate, anterior lip 3-lobed, tube ± straight
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4, didynamous or subequal, exserted or included, filaments glabrous, thecae parallel, separate at dehiscence
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes unequal to subequal (rarely equal)
Morphology Reproductive morphology Flowers Disc
Disc symmetrical
Morphology Reproductive morphology 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.

Native to:

Alabama, Arkansas, California, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, 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

  • Brachystemum Michx., Fl. Bor.-Amer. 2: 5 (1803).
  • Furera Adans., Fam. Pl. 2: 103 (1763).
  • Grant & Epling, Univ. Calif. Publ. Bot. 20: 195-240 (1943), rev.
  • 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
  • Koellia Moench, Methodus: 407 (1794).
  • Pycnanthemum Michx., Fl. Bor.-Amer. 2: 7 (1803), nom. cons
  • Pycnanthes Raf., New Fl. 4: 95 (1838).
  • Tullia Leavenw., Amer. J. Sci. Arts 20: 343 (1830).

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. 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 2021. 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