Well, in this case (assuming my identification is correct), it's a Pacific Orangetip. Butterflies have great names!
The plant is a fiddleneck of some kind. It was the flower my first San Diego County Lawrence's Goldfinches were feeding on in Poway, last March.
|Pacific Orangetip on Fiddleneck at San Dieguito River Park. April 3, 2016. Greg Gillson.|