The Autumn buttercup (Ranunculus acriformis var. aestivalis) is a herbaceous perennial. At maturity, these plants are between 1 to 2 feet tall. The stems and leaves are covered with fine hairs. The plant flowers from July to early October. There are typically six to ten flowers per plant and each flower is approximately 1/2 inch in diameter. The flowers have five yellow petals and produce twenty to forty small, dry, one seeded fruits clustered at the center of the flower.