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This genus is accepted, and its native range is N. America.
Physostegia virginiana 'Alba'

[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, glabrous or subglabrous below inflorescence, hairs simple
Morphology Leaves
Leaves mostly sessile, often amplexicaul, the lowest sometimes petiolate
Morphology Reproductive morphology Inflorescences
Inflorescence racemoid, flowers subsessile
Morphology Reproductive morphology Inflorescences Bracteoles
Bracteoles absent
Morphology Reproductive morphology Flowers Calyx
Calyx actinomorphic, somewhat inflated in fruit, 5-lobed, lobes equal
Morphology Reproductive morphology Flowers Corolla
Corolla strongly 2-lipped, 4-lobed (1/3), white to reddish violet, posterior lip flat to slightly hooded, usually entire or emarginate, tube exannulate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens equal or anterior pair longer, filaments villous, thecae parallel, not confluent, suture bordered with 1-6 (-10) small teeth
Morphology Reproductive morphology Flowers Disc
Disc with abaxial lobe equal to twice as long as ovary
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes equal to subequal
Morphology Reproductive morphology Fruits
Nutlets trigonous, glabrous, smooth or rarely verrucate.
Note
2n = 38, 76.  Twelve species. With a base number of 19, Physostegia is probably of amphiploid origin from parents with n = 9 and 10 (Cantino 1985b).  One parent may be Warnockia (n = 10), the genus with the closest phenetic relationship to Physostegia (Ca
Distribution
Northern Canada to northern Mexico.

[LKGF]
Use
Physostegia virginiana (L.) Benth. is widely grown as an ornamental and sometimes naturalised elsewhere.

Native to:

Alabama, Alberta, Arkansas, British Columbia, Connecticut, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Labrador, Louisiana, Maine, Manitoba, Maryland, Mexico Northeast, Mexico Northwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Mexico, New York, Newfoundland, North Carolina, North Dakota, Northwest Territorie, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Québec, Rhode I., Saskatchewan, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon

Introduced into:

Great Britain

Physostegia Benth. appears in other Kew resources:

First published in Edwards's Bot. Reg. 15: t. 1289 (1829)

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

  • Cantino, Contr. Gray Herb. 211: 1-105 (1982).
  • 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
  • Physostegia Benth., Edward's Bot. Reg. 15: sub t. 1289 (1829)

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

Kew Science Photographs
Digital Image © Board of Trustees, RBG Kew 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