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

Lysimachia thyrsiflora L.
tufted loosestrife
Myrsinaceae (Myrsine family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #66418)

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Distribution of Lysimachia thyrsiflora
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Species Information

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Perennial herb from a creeping rhizome, finely dark-purplish or -blackish spotted almost throughout; stems erect, solitary, simple, smooth, 20-80 cm tall.
Basal leaves lacking; stem leaves opposite, unstalked, the upper leaves linear-lanceolate to elliptic-lanceolate, narrowed gradually to the bases, long-tapering to points, as much as 15 cm long, the lowermost leaves greatly reduced.
Inflorescence short, dense, slender, stalked, spike-like clusters in the axils of the two or three larger leaves near mid-stem, the individual flowers crowded and nearly unstalked; corollas pale yellow, dotted with red or purplish-black spots, 4-6 mm, deeply 5-lobed, the lobes somewhat clawed at the bases, linear-lanceolate, about twice the length of the calyces, sparingly spotted near the tips, sometimes bearing tiny toothlike, flat structures resembling fish scales just below each notch; calyces 5-lobed, the lobes lanceolate, 2-3 mm long, smooth, spotted; filaments distinct, exceeding the corolla lobes, smooth; styles about equalling the stamens; styles and ovaries spotted; sterile stamens lacking.
Capsules, breaking into valves at dispersal, about 2.5 mm long; seeds few.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source:  The USDA

Habitat / Range

Marshes, swamps, lakeshores and wet ditches in the lowland and montane zones; frequent throughout BC; N to AK and YT, E to PQ and S to MO and WV.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Lysimachia thyrsiflora

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) 100 717 1740
Slope Gradient (%) 0 0 4
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
135 135 135
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 7 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: CDF(5), CWH(3), ICH(6), PP(1), SBPS(2), SBS(11)


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 montane boreal & cool temperate.

Synonyms and Alternate Names

Naumburgia thyrsiflora (L.) Duby

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References