Sadly, buntings do not form a monophyletic group.
They are not even all in the same family including Old World buntings (Emberizidae), New World buntings (Passerina), and snow buntings (Calcariidae).
So confusing.
This page includes birds in Passerina - 2 buntings and 1 grosbeak (out of 6 buntings and 1 grosbeak.)
	
 
Painted bunting Passerina ciris
 
Lazuli bunting (Passerina amoena)
 
Blue grosbeak (Passerina caerulea)
	
Painted bunting (Passerina ciris)
 
Snow buntings
 
By type
 
By location
 
Miscellaneous