Dill (Anethum graveolens) is a short-lived perennial herb. It is the sole species of the genus Anethum, though classified by some botanists in a related genus as Peucedanum graveolens. Its seeds, dill seeds are used as a spice, and its fresh leaves, dill, and its dried leaves, dill weed, are used as herbs. It grows to 4060 cm (1624 in), with slender stems and alternate, finely divided, softly delicate leaves 1020 cm (3.97.9 in) long. The ultimate leaf divisions are 12 mm (0.0390.079 in) broad, slightly broader than the similar leaves of fennel, which are threadlike, less than 1 mm (0.039 in) broad, but harder in texture. The flowers are white to yellow, in small umbels 29 cm (0.793.5 in) diameter. The seeds are 45 mm (0.160.20 in) long and 1 mm (0.039 in) thick, and straight to slightly curved with a longitudinally ridged surface.