kˈoʊliəz jˈuːɹɪθˌiːm, ðɪ ˈɔɹɪndʒ sˈʌlfɚ, ˈɔːlsoʊ nˈoʊn æz ðɪ ælfˈælfə bˈʌɾɚflˌaɪ ænd ɪn ɪts lˈɑːɹvəl stˈeɪdʒ æz ðɪ ælfˈælfə kˈæɾɚpˌɪlɚ, ɪz ɐ bˈʌɾɚflˌaɪ ʌvðə fˈæmɪli pˈɪɹɪdˌiː, wˌɛɹ ɪt bᵻlˈɔŋz tə ðə lˈoʊlənd ɡɹˈuːp ʌv "klˈaʊdᵻd jˈɛloʊz ænd sˈʌlfɚz" sˈʌbfɐmˌɪli kˈoʊlɪˌædɪnˌiː.
Colias eurytheme, the orange sulphur, also known as the alfalfa butterfly and in its larval stage as the alfalfa caterpillar, is a butterfly of the family Pieridae, where it belongs to the lowland group of "clouded yellows and sulphurs" subfamily Coliadinae.