Four varieties of this species are presently recognized in British Columbia: var. frigidus, var.nivalis, var. palmatus, and var. sagittatus. Petasites frigidus var. sagittatus is recognized at the variety level, however, it was previously recognized at the species level in the Illustrated Flora of British Columbia. This differs from the current presentation in the Flora of North America. However, the species taxonomy will be reassessed by the BC Conservation Data Centre shortly.
The map on this species page reflects specimens in collections not identified to the sub-taxa level.
Perennial herb from a creeping root; stems erect, branched above, numerous, more or less white woolly-hairy, with parallel-veined bracts 2.5-6 cm long, reduced upwards, 5-50 cm tall, flowering stems appear before the leaves.
Basal leaves arising directly from the creeping root, triangular to heart-shaped on long stalks, shallowly to palmately lobed or toothed, white-woolly to nearly glabrous beneath, green and somewhat hairy above, 4-50 cm long; stem leaves alternate, reduced, represented by parallel-veined bracts 1-6 cm long, 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 glandular and white-woolly; involucres 6-15 mm tall; involucral bracts oblanceolate to lanceolate, pointed, hairy basally with multicellular hairs, the crosswalls often purple, margins translucent, tips fine-hairy; ray flowers few, whitish or pinkish; disk flowers whitish.
Achenes 5-10-ribbed, glabrous, rarely sparsely long-hairy, 3-4.5 mm; pappus of numerous white, hairlike bristles.
Three varieties occur in BC.
1. Leaves merely coarsely toothed or shallowly and obscurely lobed; plants of the subalpine and alpine zones........................ var. frigidus
1. Leaves conspicuously lobed; plants of the lowland to alpine zones.
2. Leaves palmately lobed and usually deeply cleft more than 1/2 way to the leaf base, usually broader than long; plants of the lowland and montane zones........................... var. palmatus (Ait.) Cronq.
2. Leaves lobed, sometimes palmately, but usually not cleft more than 1/2 way to the leaf base, usually longer than broad; plants of the subalpine and alpine zones...................... var. nivalis (Greene) Cronq.
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
|AT(6), BAFA(65), BWBS(330), cma(4), CWH(12), ESSF(181), ICH(54), IDF(29), IMA(1), MH(17), MS(108), SBPS(16), SBS(454), SWB(95)|
Source: Klinkenberg 2013
|Scientific Name||Origin Status||Provincial Status||BC List|
(Red Blue List)
|Petasites frigidus var. frigidus||Native||S5||Yellow||Not Listed|
|Petasites frigidus var. nivalis||Native||S5||Yellow||Not Listed|
|Petasites frigidus var. palmatus||Native||S5||Yellow||Not Listed|
|Petasites frigidus var. sagittatus||Native||S5||Yellow||Not Listed|
|Petasites frigidus var. x vitifolius||Native||SNA||No Status||Not Listed|