Color, pale greenish yellow. Sepals, 5. Petals, 5, small, inconspicuous, not longer than the sepals. Leaves, thickish; those from the root roundish, 3-lobed, with petioles; those on the lower stem 3-divided, the roundish lobes irregularly cut; those above with long and narrow, uncut lobes, sessile. Stem, hollow, thick, containing an acrid juice which blisters the mouth. June and July.