American Lady

Vanessa virginiensis — the American lady — is the North American sister species to the cosmopolitan painted lady (Vanessa cardui) and one of the most widespread brushfoot butterflies in eastern and central North America. The species is widespread across all of North America from southern Canada south through the eastern US to Central America, and is a partial migrant — northern populations migrate south in autumn while southern populations remain resident year-round. Adults are 4-6 cm wingspan with bright orange-and-black wings (uppersides) closely resembling the painted lady, and intricate black-cream-and-pink wing patterns (undersides). The species is most reliably distinguished from the painted lady by the EYESPOTS on the underside of the hindwings: AMERICAN LADIES HAVE TWO LARGE EYESPOTS while PAINTED LADIES HAVE FOUR-TO-FIVE SMALLER EYESPOTS. The eyespot-count distinction is the diagnostic field-ID feature for separating the two species (which look essentially identical from the upperside view). The species' major behavioral feature is LARVAL TENT-BUILDING. Unlike most brushfoot butterfly larvae (which are solitary leaf-eaters), American lady caterpillars construct distinctive 'TENT' SHELTERS — webbing together leaves of the host plant with silk to create a small enclosed shelter where the larva rests during the day and emerges at night to feed. The tent is constructed by spinning silk threads between adjacent leaves, drawing them together, and pulling them into a small chamber lined with silk. The tent provides protection from bird predators and weather, and is one of the most visible signs of American lady larval activity on host plants. Larvae feed exclusively on plants in family Asteraceae — especially pussytoes (Antennaria), pearly everlasting (Anaphalis), cudweeds (Gnaphalium), and other 'everlasting' wildflowers (the host plant restriction is a key field-ID feature for distinguishing American lady larvae from related Vanessa species). Adults feed on nectar from a wide range of flowers (especially asters, butterfly weed, mountain mint) using a long extended proboscis. The species is widespread, harmless to humans, and a major beneficial pollinator.