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

Pulsatilla occidentalis (S. Watson) Freyn
western pasqueflower
Ranunculaceae (Buttercup family)

Introduction to Vascular Plants

© Kevin deBoer  Email the photographer   (Photo ID #21194)

E-Flora BC Static Map
Distribution of Pulsatilla occidentalis
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

General:
Perennial herb from a taprooted, woody stem-base; stems erect, 10-60 cm tall; soft-hairy.
Leaves:
Basal, (2) 3 to 6 (8), ascending, 4-8 cm long, 3-parted with each leaflet 2- to 3-times pinnatifid, the margins pinnatifid to dissected throughout, the ultimate segments linear, 1-2 mm wide, soft-hairy; stalks 6-8 cm long.
Flowers:
Inflorescence a solitary, terminal flower; flower stalks woolly or densely soft-hairy, becoming smooth in age; involucral bracts 3, sometimes more, leaf-like, similar to basal leaves, short-stalked; petals absent; sepals 5 to 7, petal-like, white, tinged purple near the bases on outside, egg-shaped, 15-30 mm long, 10-17 mm wide, hairy outside, smooth inside; stamens 150-200.
Fruits:
Achenes, numerous in a spheric head, rarely cylindric, on stalks 15-20 cm long, the achenes ellipsoid, 3-4 mm long, about 1.5 mm wide, not winged, soft-hairy; beaks (styles) curved to curved back with age, 2-5 cm long, silky-feathery.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic meadows and forest openings from the montane to alpine zones; common in S BC; E to AB and S to ID, MT and N CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Pulsatilla occidentalis

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

Minimum

Average

Maximum

Elevation (metres) 32 2035 2610
Slope Gradient (%) 0 30 190
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 177 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 7
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
841
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(66), BAFA(6), CMA(7), ESSF(621), IMA(38), MH(2), MS(1), PP(1)

Synonyms and Alternate Names

Anemone occidentalis

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References