æz ɐ ɹɪzˈʌlt ʌvðə ɹˈiːsənt sˈɪmpətɹi ænd pˈɑːsᵻbəl hˌaɪbɹɪdᵻzˈeɪʃən bᵻtwˌiːn ðiːz tˈuː spˈiːsiːz ʌv sˈʌlfɚ bˈʌɾɚflˌaɪz, nˈuːmɚɹəs stˈʌdiz hɐvbɪn kəndˈʌktᵻd ˌɔn ˌɪntɹəspɪsˈɪfɪk ænd ˌɪntɚspəsˈɪfɪk mˈeɪɾɪŋ.
As a result of the recent sympatry and possible hybridization between these two species of sulphur butterflies, numerous studies have been conducted on intraspecific and interspecific mating.