Page author: David Giblin
Lycopus uniflorus
northern bugleweed

Distribution: Both sides of the Cascades in Washington; Alaska to Newfoundland, south to northwest California and North Carolina.

Habitat: Stream banks, marshes and peat bogs, mostly in the mountains, but descending to sea level west of the Cascades.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Herbaceous, puberulent perennial from tubers with very slender rhizomes and stolons, the stems usually simple, 1-4 dm. tall.


Leaves opposite, nearly glabrous, all cauline and not much reduced upward, 2-8 cm. long and 0.6-3 cm. wide, narrowed to a short petiole, the margins coarsely and irregularly serrate-dentate.


Flowers in tight whorls in the leaf axils, sessile; calyx small, soft, obscurely nerved, the 5 ovate teeth acutish; corolla white or pinkish, 2.5-3.5 mm. long, surpassing the calyx, 4-lobed, nearly regular, the tube short; stamens 2, the upper pair (of the usual 4) obsolete.


Nutlets 4, the outer top margin toothed.

Accepted Name:
Lycopus uniflorus Michx.
Publication: Fl. Bor.-Amer. 1: 14. 1803.

Synonyms & Misapplications:
Lycopus uniflorus Michx. var. uniflorus
Lycopus virginicus L. var. pauciflorus Benth.
Additional Resources:

PNW Herbaria: Specimen records of Lycopus uniflorus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lycopus uniflorus checklist entry.

OregonFlora: Lycopus uniflorus information.

E-Flora BC: Lycopus uniflorus atlas page.

CalPhotos: Lycopus uniflorus photos.

USDA Plants: Lycopus uniflorus information.

27 photographs:
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