Pedicularis canadensis

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Common name: Canadian lousewort[1], eastern lousewort[2], wood-betony[2]

Pedicularis canadensis
Pedicularis canadensis SEF.jpg
Photo by John Gwaltney hosted at Southeastern
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicots
Order: Scrophulariales
Family: Scrophulariaceae
Genus: Pedicularis
Species: P. canadensis
Binomial name
Pedicularis canadensis
Natural range of Pedicularis canadensis from USDA NRCS Plants Database.

Taxonomic Notes

Synonyms: none.[3]

Varieties: none.[3]


P. canadensis is a perennial forb/herb/subshrub of the Scrophulariaceae family native to North America and Canada.[1]

The stems are unbranched and up to 20 cm tall. The peduncle is pubescent and the rachis is tomentose. Leaves are deeply dissected, pinnately lobed, 5-15 cm long, 1.5-5 cm wide, and mostly clustered at the base of the stem. They have an alternate arrangement, elliptic shape, and serrate margin. Flowers are borne in dense heads, two-lipped, 2 cm long, and 0.5 cm wide. The corolla is yellow or shaded with lavender with capsules that are 12-16 mm long. The capsule is 1 cm long and enclosed by green sepals. Seeds are about 10 per capsule, 5 mm long, with a brown color.[4][3]


This plant ranges from Maine, Quebec, and Manitoba, south to northeastern and Panhandle Florida, Texas, and northern Mexico.[3]



P. canadensis proliferates in moist to dry forests and woodlands and streambanks.[2] Specimens have been collected from loamy sand in hardwood forest, border of swamp area, and magnolia-beech-oak woods.[5]


P. canadensis flowers from April through May and fruits from May through July.[3]

Fire ecology

P. canadensis is not fire resistant, but has a medium fire tolerance;[1] despite this, populations have been known to persist through repeated annual burning.[6]


P. canadensis is visited by leafcutting bees from the Megachilidae family such as Osmia collinsiae.[7]

Conservation, cultivation, and restoration

Cultural use

Photo Gallery

References and notes

  1. 1.0 1.1 1.2 USDA Plant Database
  2. 2.0 2.1 2.2 Weakley, A. S. (2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC, University of North Carolina Herbarium.
  3. 3.0 3.1 3.2 3.3 3.4 Weakley, A.S. 2015. Flora of the southern and mid-atlantic states. Working Draft of 21 May 2015. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
  4. Musselman, L. J. and W. F. Mann, Jr (1978). Root parasites of southern forests. , USDA Forest Service, Southern For. Exp. Station, New Orleans, LA. Gen. Tech. Rpt. SO-20. : 76.
  5. URL: Last accessed: June 2018. Collectors: Loran C. Anderson, Rodie White, R.K. Godfrey, William Platt, M. Carr. States and counties: Florida (Gadsden, Jackson, Leon, Washington, Wakulla) Georgia (Thomas, Grady)
  6. Platt, W.J., R. Carter, G. Nelson, W. Baker, S. Hermann, J. Kane, L. Anderson, M. Smith, K. Robertson. 2021. Unpublished species list of Wade Tract old-growth longleaf pine savanna, Thomasville, Georgia.
  7. [1]