I have no idea what this blossom is called but I see a white bird in yellow plumage and will have to leave it at that!  The two times that I have seen these flowers have both been in greenhouses – once at the Denver Botanic Gardens and once at the Fort Collins Spring Creek Gardens with butterfly pavilion – which is where this blossom was captured.  I did not capture ANY butterflies on camera that day as it was cloudy and every one of them was hiding.  But beautiful surprises like this blossom make a visit worthwhile.  Perhaps a butterfly capture another day.