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Montana Field Guide

Montana Field Guides

Edwards' Fritillary - Speyeria edwardsii


Global Rank: G5
State Rank: S5

Agency Status
USFWS:
USFS:
BLM:


 

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General Description
[From Ferris and Brown 1981, Scott 1986, Glassberg 2001] Forewing 3.2-4.0 cm. A large brightly colored fritillary. Forewings pointed. Dorsal surface bright orange color withbold black border of both wings, postmedian and marginal spots on forewings distinctly paler than surrounding ground color, counting from the body the 3rd forewing black bar does not touch the 2nd black bar; ventral surface green or gray-green with elongate metallic silver spots and narrow buff submarginal band, ventral hindwing marginal pale spots rounded inwardly.

Phenology
One flight; late June to early September (Scott 1986), late May to early September (Glassberg 2001).

Diagnostic Characteristics
Differentiated by combination of dorsal black border, postmedian and marginal spots on forewings distinctly paler than surrounding ground color, counting from the body the 3rd forewing black bar does not touch the 2nd black bar, ventral hindwing marginal pale spots rounded inwardly, and ventral surfaces with strong greenish reflections.

Species Range
Montana Range

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Range Comments
Southern Alberta, Saskatchewan, and southwestern Manitoba south to extreme northern New Mexico in the west, western North and South Dakota, western Nebraska and Kansas in the east (Scott 1986, Glassberg 2001); up to 2745 m in Wyoming, 2925 m elevation in Colorado (Brown 1957, Ferris and Brown 1981). Statewide in Montana except the extreme western counties west of the continental divide (Kohler 1980, Stanford and Opler 1993). Uncommon to common (Glassberg 2001).

Summary of Observations Submitted for Montana
Number of Observations: 1

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Non-migratory.

Habitat
Chaparral, prairie, foothills, montane forest openings (Brown 1957, Ferris and Brown 1981, Scott 1986). In Glacier National Park, reported in mesic montane meadows (Debinski 1993).

Food Habits
Larval food plants include species of Viola. Adults feed on flower nectar (including Agoseris, Apocynum, Astragalus, Buddleja, Carduus, Ceanothus, Centaurea, Chrysothamnus, Cirsium, Eleagnus, Erioganum, Erysimum, Eupatorium, Gaillardia, Grindelia, Heracleum, Jamesia, Liatris, Lithospermum, Medicago, Melilotus, Monarda, Oxytropis, Penstemon, Prunus, Rudbeckia, Sedum, Senecio, Symphoricarpos, Trifolium, Verbena), mud, and dung (Scott 1986, 2014).

Reproductive Characteristics
Females lay eggs singly and haphazardly near the food plants (Viola) or where they will emerge in spring. Eggs usually not laid until about August, unfed first instar larvae (L1) overwinter. Larvae feed on leaves, build no nests. Males patrol throughout the day in open areas in search of females, generally regardless of topography, but also frequently patrol and mate in shrubby areas near hilltops (Scott 1975b, 1986).

References
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Citation for data on this website:
Edwards' Fritillary — Speyeria edwardsii.  Montana Field Guide.  .  Retrieved on , from