Leaflets of 3
These plants were in rosettes 4 to 6 inches across, with stems only about 1 inch off the ground. They were on a roadside, shaded bank, in dry ground that was mostly shale.
Leaves were in whorls of 3. They appeared to be alternating, with 2 on one side, opposing the 3rd, and then switching 180 degrees around the stem. Leaves were only about 0.050 inch wide by 0.180 inch long, with tiny stipules at their base. The whitish stuff on the plant in the 1st photo is frost, since it was just 25F this morning when the photos were taken.