GROWTH HABIT: Perennial, erect, bushy, to 6 feet tall.
LEAVES: Dark green, alternate, deeply divided into numerous narrow, toothed leaflets (fern- like).
STEMS: Often purplish-red in color.
FLOWER: Yellow, button-like, without petals, ½ inch across in flat topped dense clusters.
ROOTS: Reproduces from roots.
SEEDS: Yellowish brown with short 5 toothed crown.
OTHER: Escaped Eurpean aromatic ornamental and medicinal plant