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

Petasites frigidus var. sagittatus (Banks ex Pursh) Cherniawsky
arrow-leaved coltsfoot
Asteraceae (Aster family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #9932)

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Distribution of Petasites frigidus var. sagittatus
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Species Information

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Perennial herb from a creeping rhizome; stems erect, branched above, numerous, more or less white woolly-hairy, 10-50 cm tall; flowering stems appear before the leaves.
Basal leaves triangular on long stalks, shallowly to conspicuously toothed, usually with 20 or more teeth per side, white-woolly to nearly glabrous beneath, green and somewhat hairy above, 5-35 cm long including the stalk, 5-25 cm wide; stem leaves reduced to parallel-veined bracts, 1-8 cm long, reduced upwards, more or less white woolly-hairy.
Heads disciform or with ray and disk flowers, several to many in a round- to flat-topped inflorescence, stalks more or less white woolly-hairy; involucres 7-12 mm tall; involucral bracts oblanceolate to lanceolate, pointed, hairy basally with multicellular glandular hairs, the crosswalls often purple, margins translucent and often ragged; ray flowers few, whitish or pinkish, 6-10 mm long; disk flowers whitish.
Achenes 5-to 10-ribbed, glabrous; pappus of numerous white capillary bristles.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet to moist bogs, fens and marshes in the montane to subalpine zones; common throughout BC east of the Coast-Cascade Mountains; N to AK, YT and NT, E to PQ and S to WI, ID, CO and WA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Petasites frigidus var. sagittatus

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) 30 1102 2340
Slope Gradient (%) 0 4 300
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
1 226 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 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: BAFA(1), BG(1), BWBS(42), CWH(1), ESSF(36), ICH(38), IDF(33), IMA(2), MH(1), MS(64), PP(4), SBPS(33), SBS(58), SWB(6)

Synonyms and Alternate Names

Petasites dentatus Blank.
Petasites sagittatus (Banks ex Pursh) A. Gray

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References