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Species Page - Boloria napaea
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scientific name    Boloria napaea    

common name     Mountain Fritillary

A species of moist alpine and subalpine meadows.

The single yearly brood flies from early July to early August, depending on snowpack.

The black-spotted, orange upperside is immediately recognizable as belonging to a Boloria. The hindwing shape, with a slight outward point at the outer margin, is however unique to napaea. Females are slightly larger and have a washed-out pale orange upperside ground colour. D. Macaulay image
Subspecies alaskensis, which actually appears to be a species distinct from the European napaea (see Opler & Warren 2003 for a literature summary), occurs in Alberta.

life history
The immature stages of North American populations are undescribed. Larvae may overwinter twice, taking two seasons to reach maturity. Males patrol about 30 cm above the ground (Scott 1986).

Not of concern.

diet info
The larval foodplant is unknown; possibly Vaccinium (Guppy & Shepard 2001) and / or Alpine Bistort (Polygonum viviparum) in BC (Scott 1986).

Siberia to Alaska, south to the Willmore Wilderness, Alberta and east to the west shore Hudson Bay (Layberry et al. 1998, Bird et al. 1995), with isolated populations in Wyoming (Scott 1986).

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Related Species Info
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References (4)
Specimen Info
There are 48 specimens of this species in the online database
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Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (48)


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