These seeds have continued to cover my patio in late February and early March here in Tulsa, Oklahoma. I don't remember seeing these in previous years.

Those are likely to be seeds of Platanus sp. (Sycamore).

Look around your neighboring properties. Any American Sycamore or London Plane trees evident?

Wind can bring these seeds in from a reasonable distance.

I knew they looked familar! Its been driving me crazy all day - we had a huge sycamore in our yard in California.

Thanks John!

Thanks. My neighbor has a huge sycamore in his backyard. After all these years I now know what sycamore seeds look like. Thanks again.

Happy to oblige.

I have three Platanus occidentalis neighboring my deck/backyard. All three are volunteers, one being the offspring from the two older ones. The two older ones volunteered from a neighboring farm - those parent plants being more than a thousand feet from where these are now growing. I had no sycamores on my property when we purchased it 33 years ago.

These thin individual seeds in your photo (achenes) come from the aggregate golf ball-shaped and sized structure (syncarp) formed on the tree which hangs by a several inch long stem (peduncle).

Those seeds have a way of getting around, and into places difficult to remove them (gutters, downspouts, between deck boards, siding, etc.