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Physostegia virginiana
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Lamiaceae
Genus: Physostegia

See text

Physostegia is a genus of flowering plants in the family Lamiaceae, native to eastern North America. They are erect rhizomatous herbaceous perennials inhabiting damp, sunny places. They grow up to 2 m (7 ft) tall with purple or pink tubular flowers in racemes in summer.[1]

The generic name comes from two Greek words, physa (a bladder) and stege (a covering), referring to the calyx, which becomes full of fruit when mature.[2]

It is suggested that it is a wholly North American genus of 12 species. Physostegia virginiana is the most common of these species, and is known as "obedient plant".

Selected species[edit]


  1. ^ RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1-4053-3296-4. 
  2. ^ Coombes, Allen J. (2012). The A to Z of plant names. USA: Timber Press. p. 312. ISBN 978-1-60469-196-2. 

University of Texas Herbarium