|scientific name Boloria improba |
common name Dingy Fritillary
Moist, willow-rich alpine tundra.
Biennial, flying during July of even-numbered years.
The upperside is a smudged, brown and dull orange. The hindwing underside markings consist of a yellow-tan median band and pale whitish costal patch on purple-brown background. The small size and dull appearance distinguishes this species from other Boloria.
Our populations are subspecies nunatak (Scott 1998).
The immature stages are undescribed. Colonies of this butterfly tend to be very localized, and adults have a weak, ground-hugging flight.
Not of concern.
The larval host plants are unreported in Alberta; Dwarf willows such as Salix reticulata nivalis are used in Colorado (Scott 1986). Adults nectar at Moss Campion (Silene acaulis) and yellow composites in Alberta (Bird et al. 1995).
Alaska to Baffin Island, south to west-central Alberta. Isolated populations occur in Wyoming and Colorado. Also found in Scandinavia and Siberia (Scott 1986).
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