Here come the taxonomy folks, pitchforks in hand :) Anyway, this genus has long been Mimulus but since 2012 has been accepted as Erythranthe. Furthermore, there is some discussion about distinct species probably belonging together in one. I'll let you follow the links over on SW Colorado Wildflowers if you'd like to read further on this topic, but for now, here are some pretty pictures of Erythranthe in and next to streams where they've been for milenia, despite their names.