The photo was taken in a wet area. The plant resembles the Cardamine cordifolia (Heartleaf Bittercress) which is present in this area.

They are found at higher elevations in Colorado, so....

I wonder what the larva ate, as Impatiens isn't known from New Mexico. (It is in parts of Colorado, though.) Or was this a vagrant?

And I wonder whether this is the common black lep with white spots in the New Mexico Sangre de Cristo mountains. I tried to catch up with some this past summer, but never succeeded.

It is not unlikely that eggs could be transported on plants sold at Home Depot or other nursery. So far as I know, there's nothing else that looks like a White-striped Black. BTW any idea what's the plant it's nectaring on?

I believe the flower is Cardamine cordifolia, Heart-leaf Bittercress, in the mustard family.

"Nothing else that looks like" it is a refreshing change!

Do these moths feed on the tropical Impatiens of so many gardens, or just on our native jewelweeds? If they do feed on the tropical plants, and if they're the ones I see in the mountains, I'd be a bit surprised that I don't see them in towns, too. But there could be explanations.

Next summer maybe I'll see whether these are the moths I see ("common" was an exaggeration) and I'll look for caterpillars. This page says the caterpillars are green inchworms that rest sticking out from the plant like petioles whose leaves they've eaten. It also says they feed on Circaea alpina, Enchanter's Nightshade (actually in the evening primrose family). That's recorded from New Mexico but not Santa Fe County. Anyway, we certainly have other plants in its family, and if it's not limited to Impatiens things are less mysterious.