Indigo Bunting (Passerina cyanea) Science Article 2
abstract
FOUR buntings of the genus Passerina breed in the United States: Indigo (P. cyanea), Lazuli (P. amoena), Varied (P. versicolor), and Painted (P. ciris).
WALTER KINGSLEY TAYLOR, The Auk 91: 485-487. July 1974