lists five North American species in this genus.
Holarctic. Anthocharis cardamines is found in Eurasia, for instance, and is very similar to the North American orangetips.
Butterflies of North America page
shows several members of this genus.
The Anthocharis sara complex has been revised by Todd Stout:
Stout, T.L., 2018. A review of three species-level taxa of the Anthocharis sara complex (Lepidoptera: Pieridae: Pierinae: Anthocharidini). Insecta Mundi 0615: 1–38. http://journals.fcla.edu/mundi/article/view/106138