Fritillary butterfly?

Blipped this butterfly on a white buddleia (butterfly bush) at the arboretum this afternoon, and I think it is a fritillary, although I have no idea what kind. If anyone can ID it I would appreciate some help.

I'm still dragging around with the sniffles and scratchy throat, but after hanging around the house yesterday and most of Wednesday, I couldn't sleep last night. I'm hoping this afternoon's brief wander around the butterfly garden will be my antidote to another restless night.