Black Swallowtail

Dill (Anethum graveolens)
Fennel (Foeniculum vulgare)
Parsley (Petroselinum crispum)

Pipevine Swallowtail

Azalea
Dame's rocket (Hesperis matronalis)
Lantana
Lilac (Syringa)
Lupine
Petunia
Phlox

Pipevines (Aristolochia species)
Verbena

Gulf Fritillary

Passionflower (Passiflora spp.)

Buckeye

Sedum (Sedum spp.)
Snapdragon (Antirrhinum spp.)
Toadflax (Linaria)

Dainty Sulphur

Aster (Asteraceae)
Marigold (Tagetes spp.)

Hairstreak

Willow (Salix spp.)

Meadow Fritillary

Violet (Viola odorata)
Composites (aster, goldenrod, ironweed, Joe-pye weed, yarrow, etc.)

Monarch

All season: Milkweed (Asclepias spp.)
Early season: Lantana Lilac
Late season: Blazing Star, Goldenrod, Ironweed, Tickseed, Sunflower

Mourning Cloak

(Feeds on sap)
Oak (Quercus spp.)
Poplar (Populus spp.)
Willow (Salix spp.)

Painted Lady

Aster
Blazing star (Liatris spicata)
Cosmos
Hollyhock (Alcea rosea)
Ironweed (Vernonia)
Joe-pye weed (Eupatorium purpureum)
Mallow (Malvaceae)

Tiger Swallowtail

Ash (Fraxinus)
Birch (Betula)
Cottonwood (Populus)
Mountain ash (Sorbus)
Poplar (Populus spp.)
Willow (Salix)

(Dark form female swallowtail shown)