Tall buttercup (Giant buttercup)
Tall buttercup is an upright, perennial broadleaf plant that grows from a cluster of fibrous roots. Stems are 1 to 3 feet tall, hairy, hollow, leafy below and branched above. Each root crown typically has several stems in a cluster. Flowers have 5 to 7 glossy yellow petals, are about 1 inch wide, and grow on long stalks.
Leaves at the base grow on long stalks and are divided deeply into 3 to 7 coarsely lobed segments that radiate from a common point like fingers on a hand. The upper leaves are smaller and have fewer lobes and teeth. Leaves are softly hairy. Seedlings have 2 egg-shaped cotyledons with 3 to 5 noticeable veins. Young plants form a rosette. The first true leaves are hairy, round to heart-shaped in general outline, and shallowly lobed and toothed. Leaves have long leaf stalks that are hairy except at the base.