The Gulf Fritillary butterfly (agraulis vanillae) is generally 2.5 to 3.2 inches in size, ranges year-round throughout Florida in open, sunny areas such as old fields, meadows, pastures and roadsides.
Its larval host plants are various passionflower vines including Maypop (Passiflora incarnate), Yellow Passionflower (P. lutea), Corky-stemmed passionflower (P. suberosa), Blue Passionflower (P. caerulea), and Many-flowered Passionflower (P. multiflora). When you have a few moments, do a web search for images of some of the above passionflowers. I don’t use any photographs that aren’t my own unless the photographer is someone I can reach to get permission. The passionflowers are amazingly very different – whites, reds, purples, etc. – in the 500 species of the family Passifloraceae. I finally got my hands on two different kinds of passionflower this year but I do not have them permanently planted.
What I found with the Gulf Fritillary through simple observation, is that they tend to run in packs of two or three butterflies. Also, they do not necessarily choose plants as a larval host. I saw them, on two different occasions, lay eggs on my wooden porch posts on the side facing out into the sun.