Color, bright yellow. Sepals, 5. Petals, 5, 6, or 7, much larger than the sepals. The first root-leaves are roundish, 3-parted, toothed. Later ones have a central stalked lobe larger than the lateral segments, all much divided or parted. Upper stem-leaves linear, undivided. Plant very leafy and silky, with soft, white hairs. Roots clustered, thick, fleshy, giving the specific name. 6 to 12 inches high. April and May.