Nat. ord., Umbelliferae.
Characters. - Root dark brown, very knotty, wrinkled horizontally; fibres of the same colour growing downward. Internally yellowish-white, with an odour resembling Iris Versicolor, and a sweetish aromatic taste, succeeded by bitterness and a pungency affecting the fauces. It also resembles the taste of Senega.
An account and proving of this are given in Hale's New Remedies.
Part employed. - The root.