To use the native plant finder, and to locate specific lepidoptera that use each plant requires giving site location info... that's irritating...
But once that's done, you can go to each individual plant and see butterflies that use as host... like the evening primrose for instance...
https://nativeplantfinder.nwf....
Amazing how many of these animals only use evening primrose!
While pictures aren't on site yet... googling for the pics is showing me butterflies that I've seen around... so... that's kinda cool...
My usual methodology of knowing which butterflies used specific plants was to catch them laying eggs...