Pyrrhia exprimens
(Walker, 1857)
Purple-lined Sallow
Pyrrhia exprimens, commonly known as the purple-lined sallow, is a in the Noctuidae, Heliothinae. It has a transcontinental distribution spanning North America and northern Eurasia. The was first described by Francis Walker in 1857 and is characterized by moderate size with distinctive wing patterning.
Pronunciation
How to pronounce Pyrrhia exprimens: /ˈpɪə.ri.ə ɛkˈspraɪ.mɛnz/
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Identification
The purple-lined patterning on the forewings is the primary distinguishing feature, reflected in the . Similar to other Pyrrhia and Heliothinae , but the specific wing pattern and geographic range help differentiate. Genitalia examination may be required for definitive identification from closely related species.
Images
Appearance
Wingspan 35–38 mm. Forewings display purple-lined patterning characteristic of the , with variable brown, orange, and purplish tones. Hindwings typically paler with less distinct markings. Body robust, typical of Noctuidae.
Habitat
Occurs in diverse across its broad range, including and temperate zones. Found in areas supporting larval plants including open woodlands, meadows, and riparian corridors where Polygonum grow.
Distribution
North America: Newfoundland and Labrador west across southern Canada to southern Vancouver Island, south to Texas, Arizona, and California. Eurasia: Finland, West Siberian Plain, South Siberian Mountains, and Kazakhstan.
Seasonality
active from May to August. Single or partial depending on latitude and local conditions.
Diet
Larvae feed on Polygonum , Aconitum septentrionale, and a variety of other plants. feeding habits not documented in available sources.
Host Associations
- Polygonum - larval food plantmultiple
- Aconitum septentrionale - larval food plant
Life Cycle
Complete with , larval, pupal, and stages. Specific duration and stage not documented in available sources.
Ecological Role
Larval herbivore; contributes to nutrient cycling through herbivory on Polygonum and related plants. role in pollination not documented.
Human Relevance
No documented economic or agricultural significance. Occasionally encountered by naturalists and enthusiasts.
Similar Taxa
- Other Pyrrhia speciesSimilar size and general appearance; require examination of wing pattern details or genitalia for separation
- Heliothinae mothsShared characteristics including robust body and similar period; distinguished by specific wing patterning
More Details
Taxonomic History
First described by Francis Walker in 1857. Placement in Heliothinae reflects modern molecular and morphological understanding of Noctuidae relationships.
Collection Records
Well-represented in entomological collections; University of Alberta E.H. Strickland Entomological Museum holds documented specimens.