A. Wilson, 1810,
within a few miles of Philadelphia, Pennsylvania, USA.
Forms a species pair with G. tolmiei. Also known to have hybridized with G. trichas, G. formosa and Cardellina canadensis. Reported hybrids with Oporornis agilis (which see) have not been confirmed; reported hybrid with Vermivora cyanoptera now considered to have involved interbreeding of latter species with G. formosa. Monotypic.
CW & S Canada (SE Yukon and E British Columbia E to Newfoundland and Nova Scotia) and in NE USA S to N Illinois, N Ohio, N New England and, in Appalachians, to West Virginia. Migrates to Central America (S from S Nicaragua) and NW South America.
Food and feeding
Status and conservation
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