If you live nearby, and want to help this species survive (as opposed to kill it and sell its corpse), note that its larval food plant is Penstemon neomexicanus:
From
1999 Federal Register, 72300; Centralized Library: U.S. Fish and Wildlife Service
The adult butterfly is often found in association with the larval foodplant, New Mexico penstemon (Penstemon neomexicanus), and adult nectar sources such as sneezeweed (Helium hoopesii).
I used to breed a lot of monarchs and painted ladies, and one good butterfly garden can really help a species. But you have to have the larval plants, not just nectar plants.