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

Myosurus apetalus C. Gay
bristly mousetail (sedge mousetail)
Ranunculaceae (Buttercup family)

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #24123)

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Distribution of Myosurus apetalus
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Myosurus apetalus var. borealis

Species Information

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Annual herb from taproot; stems erect, 1-12 cm tall.
In basal clump, simple, linear or narrowly oblanceolate, 0.9-4 cm long, entire.
Inflorescences of solitary, terminal flowers; flower shoots 1-12 cm long, shorter than leaves when flowering, but longer in fruit; bracts none; petals none to 5, distinct, white, linear to narrowly spoon-shaped, 1-2.5 mm long, long-clawed, the claw 1- to 2-times as long as blade, nectary on upper surface; sepals (3) 5 (-8), green with wide membranous margins, narrowly oblong, 1.5-2.5 mm long, spurred, the blades slightly longer than spurs, usually 1-veined; stamens usually 5; pistils 20-50 (90).
Achenes, 20 to 50 or more in a spike 4-10 mm long, 1.5-2 mm wide; beaks diverging, 0.6-1.4 mm long; seeds 1.5 times as long as wide.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Vernally moist meadows, streambanks and pools in the steppe zone; rare in SC BC; S to MT, WY, UT, NV and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Myosurus apetalus

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) 1710 2178 2431
Slope Gradient (%) 0 38 68
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
81 146 176
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 4
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: AT(2), CMA(1), ESSF(1)


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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References