Ranunculus pygmaeus Wahlenb.
pygmy buttercup
Ranunculaceae (Buttercup family)

Introduction to Vascular Plants

Photograph

© Jamie Fenneman     (Photo ID #30110)


Map

E-Flora BC Static Map

Distribution of Ranunculus pygmaeus
Click here to view the full interactive map and legend

Species Information

General:
Perennial herb from short stem-base and slender, fibrous roots; stems slender, erect or ascending, 0.6-3.5 (10) cm tall, becoming smooth below, minutely-hairy above, not hollow.
Leaves:
Basal persistent, kidney-shaped to semicircular, deeply 3-lobed or -parted, 0.5-0.9 cm long, 0.6-1.3 cm wide, the lateral segments lobed, bases squared-off or nearly heart-shaped, tips rounded to blunt, the stalks to 4 cm long, very slender; stem leaves few, shorter-stalked; bracts usually of 3 linear to narrowly lanceolate lobes, 5-10 mm long.
Flowers:
Inflorescence usually a solitary, terminal flower, sometimes 2-flowered, the stalks 1-7 cm long, smooth or hairy; receptacle smooth; petals 5, distinct, yellow, 1.2-3.5 mm long, 1-3 mm wide, egg-shaped, short-clawed, nectary on upper surface, the nectary scale smooth, about 0.3 mm long; sepals 5, early deciduous, spreading, greenish, 2-4 mm long, 1.2-1.6 mm wide, sparsely hairy above; stamens 10-20; pistils 25-50.
Fruits:
Achenes, several to many in a globe-shaped to cylindric head 2.5-7 mm long, 2.5-5 mm wide, the achenes egg-shaped, 1-1.2 mm long, 0.8-1.1 mm wide, smooth; beaks persistent, slender, awl-shaped, straight or slightly curved at tip, 0.3-0.7 mm long.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Ecology

Ecological Framework for Ranunculus pygmaeus

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

Avg

Min

Max

Elevation (metres)
1643 1494 1753
Slope Gradient (%)
11 2 34

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

139 58 225
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 1 8
Modal Nutrient Regime
Class
C
# of field plots
 species was recorded in:
5
Modal BEC Zone Class
BAFA

All BEC Zones (# of stations/zone) species was recorded in

BAFA(5)

Habitat and Range

Moist to wet seepage sites, snowbeds, shady ledges and scree slopes in the subalpine and alpine zones; infrequent, scattered throughout BC; circumpolar, N to AK, YT and NT, E to Labr. and Greenland and S to CO and UT; Iceland, N. Eurasia.

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Ranunculus pygmaeus var. langianus