Hello.
Found this in Appalachian mtns, Northern VA. Woodland edge, scrubby area so could be non-native... Opposite leaf arrangement, single flower on stalk attached at leaf axil, so 1 flower per pair of leaves, 5 petal segments....looks as if 2 rays are "fused" together for each of these 5 segments (hard to see in pic because it was wet), yellow center. Leaves and stem pubescent and plant low to ground but most likely grazed by deer so who knows what actual height should be. Flowering now...not sure when it started.
Thanks for any ideas!