About a century ago, observing Sulphur Cinquefoil (Potentilla recta) would have required a trip to Europe. But now this herbaceous perennial is established in fields and along roadsides throughout much of North America and as such can be studied year-round, if you know where to look.
While the plant's five-petaled, yellow flowers are of no assistance for white season identification, the numerous five-parted, hairy seed capsules, which are found at the tops of the many-branched, 2-3' tall stalks, are. These capsules account for another common name for this species: Rough-fruited Cinquefoil.
The alternately arranged leaves are palmately divided (like those of Common Blackberry) into 5 or 7 leaflets (upper leaves may have only 3), and dried leaves often persist into the white season and can assist with identification efforts.
For help with keying out a mystery white season plant skeleton, I recommend A Guide to Wildflowers in Winter: Herbaceous plants of northeastern North America (1995) by Carol Levine (additional guides are listed on my Book Picks page under Winter Exploring). For more photos of Sulphur Cinquefoil, visit GoBotany.