GROWTH HABIT: Perennial, up to 4 ft. Tall.
LEAVES: Prickly serrations on margins, may be deep lobed, narrow at base. Upper leaves clast stem. Alternate, usually crowded on lower ½ of stem.
STEMS: Erect, finely grooved, hollow between joints, milky juice.
FLOWER: Brightly yellow, flat topped, clustered, 1 to 2 inches in diameter.
ROOTS: Creeping horizontal roots, give rise to new shoots at joints. Yellowish white with milky juice.
SEEDS: Reddish brown, 1/8" long, 5 to 7 length-wise ribs.
OTHER: Reproduced by seed and creeping roots.