Linda adjusted her position to face the trees…. The powerful drum of a beak against dead bark carried through the woods and she scanned the overstory for a pileated woodpecker. It flew a series of arcing loops and landed in the boughs of an ash tree. Below it grew crinklefoot ferns. A row of Queen Anne’s lace swayed in the ditch.—Chris Offutt, The Killing Fields (2021), pp. 132-133
Any idea what Offutt means by crinklefoot fern? Anyone? The only thing botanical that turns up for me is Crinkleroot (Cardamine diphylla)—not a fern by any stretch.