Can anyone nudge me in the right direction for an ID based on this photo of seed pods?

This is the only image I have (sent to me).

Genus level would be great. They seem familiar...

Growing in Ohio in a plant collector's sunny garden.
(No, I can't ask them. )

Remind me of Evening primrose. Oenothera sp. If that is a herbaceous plant, but if it is shrub, or woody thing, ignore my suggestion

Evening Primrose

Yes, I think so, too. Pods should be quite substantial and woody-like, despite it being an herbaceous plant.

Thanks to you all!

I knew they seemed familiar, but I guess Oenothera seemed so out of context for the garden that it didn't occur to me. A weedy Oenothera biennis could have sneaked in while the gardens were a bit neglected. Then again, it could be a special type. I'll likely never know.

Thanks again!