I just stumbled upon an awesome database! Check out HOSTS-a Database of the World's Lepidopteran Hostplants. You can search by family, genus and/or species of butterflies and moths AND/OR by family, genus and/or species of plants along with a location.
This database is hosted by the Natural History Museum in London.
I ran a search of milkweeds (Asclepias sp.) in the USA and came up with 53 results. So cool!
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