E-Flora BC: Electronic Atlas of the Flora of British Columbia

Lycopus uniflorus Michx.
northern water horehound (northern bugleweed)
Lamiaceae (Mint family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #19713)

E-Flora BC Static Map
Distribution of Lycopus uniflorus
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Species Information

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Perennial herb from a slender rhizome that is abruptly thick and tuber-like at tip; stems ascending to erect, 10-60 cm tall, simple or occasionally branched, finely to stiff-hairy, 4-angled.
Opposite, elliptic to lanceolate, 2-8 cm long, 0.6-3 cm wide, gradually narrowed at tip and base, glabrous or minutely rough-hairy, margins coarsely and irregularly toothed; usually short-stalked; uppermost leaves not much reduced.
Inflorescence of many head-like, axillary flower clusters; corollas tubular, 4-lobed, white or pinkish, 2.5-3.5 mm long, surpassing the calyces; calyx teeth 5, egg-shaped, soft, blunt to somewhat pointed at tips.
Nutlets, 4 clustered together, 1-2 mm long, 0.8-1.2 mm wide, 3-angled, corky-thickened at edges, somewhat flat and finely toothed at the top.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Marshes, fens, and stream and lake margins in the lowland and montane zones; frequent in SW BC, less frequent northward and eastward; N to AK, E to NF and S to NC, AR and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Lycopus uniflorus

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 0 372 1046
Slope Gradient (%) 0 1 85
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
62 209 225
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 6 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BWBS(1), CDF(12), CWH(70), ICH(14), IDF(1), MH(1), MS(1), SBS(3)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References