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

Caltha leptosepala var. biflora DC. (DC.) G. Lawson
white mountain marsh-marigold
Ranunculaceae (Buttercup family)

Introduction to Vascular Plants
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Distribution of Caltha leptosepala var. biflora
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Species Information

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General:
Perennial herb from a short, thick stem-base with fibrous roots; stems erect, 5-40 cm tall; plants smooth, fleshy.
Leaves:
Basal leaves waxy green, the blades oblong egg-shaped to circular or kidney-shaped, 2-12 cm long, margins wavy coarse-toothed, round-toothed, or nearly entire; long-stalked (2-25 cm).
Flowers:
Inflorescence a 1- or 2- (4-) flowered, terminal cyme, the flowers 2-4 cm wide; flower stalks erect, usually leafless or with 1 leaf; petals absent; sepals 6 to 12, white or greenish, tinged bluish on outside, oblong, 8.5-23 mm long; stamens 50 or more.
Fruits:
Follicles, 4 to 15, spreading, linear-oblong, 10-20 mm long, 3-4.5 mm wide; beaks straight or curved, 0.5-1.8 mm long; seeds brown, elliptic, 1.9-2.5 mm long, surface longitudinally wrinkled or grooved.
Notes:
Two varieties occur in BC:

1. Leaves longer than wide, the margins more sharp-toothed than round-toothed; flowers usually 1 per stem; subalpine and alpine......................... var. leptosepala

1. Leaves nearly as wide as long, the margins subentire to broadly round-toothed; flowers mostly 2 per stem; lowland to subalpine........................... var. biflora (DC.) Lawson

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet to moist meadows, bogs, fens, streambanks and seepage sites from the lowland to alpine zones; common in W BC, west of the Coast-Cascade Mountains (var. biflora), frequent throughout BC except Queen Charlotte Islands and adjacent coast (var. leptosepala); N to SW AK and S YK, E to AB and S to NM, AZ and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Caltha leptosepala var. biflora

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) 6 797 2120
Slope Gradient (%) 0 21 100
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 328 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 5 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
179
Modal BEC Zone Class
CWH
All BEC Zones (# of stations/zone) species was recorded in: AT(3), BAFA(3), CMA(2), CWH(88), ESSF(14), MH(67), SBS(2)

Climate

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 not evaluated, unknown or variable.

Synonyms and Alternate Names

Caltha leptosepala subsp. howellii (Huth) P.G. Sm.

Taxonomic and Nomenclatural Links

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General References