It is closely related to Common Yellowthroat, Belding's Yellowthroat, and Bahama Yellowthroat, with which it forms a superspecies. It has been considered conspecific with these species.
The Yellow-crowned Yellowthroat is classified as Vulnerable (VU), considered to be facing a high risk of extinction in the wild.
that yellow-crowned yellowthroat–its former name, by the way–that just pierced me. I realize that this is not the best photo, but maybe you can catch a whiff of what gets me about this bird. Here’s a less obstructed view of a male, taken by Lee Zieger. I admit, this may be something of an acquired taste. To see an Altamira Yellowthroat, you head out of the nice shady forests and scour the cattails in roadside ditches. More