Slender, erect, sometimes aromatic, perennial herb, 0.3-0.8 m high. Leaves slender-petiolate, radical ones often simple, ovate, cordate, entire or toothed and in succession upwards becoming divided and pinnate, leaflets linear to lanceolate. Involucral bracts absent or 1. Rays 6-8, Calyx teeth absent. Petals white, glabrous, hirsute or villous. Flowering time Jan.-Mar. Fruit ovoid to broadly ovoid, slightly laterally flattened, 2-3 mm long, glabrous or hairy; vittae ± 9, 2 or more in each furrow, 2 on inner face.
We here follow Townsend (1983) in considering all the South African material as belonging to a single polymorphic species, including: P. hydrophila H.Wolff, P. krookii H.Wolff, P. schlechteri H.Wolff, P. stadensis (Eckl. & Zeyh.) D.Dietr. and P. transvaalensis H.Wolff. Distinguished by the slender perennial habit, the extremely variable simple to palmatisect basal leaves and more deeply divided to pinnate upper leaves, the white pilose to glabrescent petals and the pilose to glabrescent rays and fruits.
An erect slender herb. It grows 1 m tall. It has an aroma. The stems are circular and branched with some hairs. The leaves have slender stalks and the lower ones near the base are simple. They are oval or heart shaped with deep teeth. The leaves on the stems are deeply divided with leaflets along the stalk. The flowering stems have slender branches with a group of flowers with equal length stalks. The flowers are smal land 2 mm long. They are white. The fruit is oval or oblong with a disc at the top.
Slender, erect perennial to 45 cm, finely hairy above. Lower leaves palmately divided, upper leaves pinnatisect or bipinnatisect, leaflets linear to lanceolate. Flowers in compound umbels on branched peduncles, white. Fruit broadly ovate, usually hairy, mericarps isodiametric, homomorphic, ribbed, vittae present, 3 or 4 between each rib, rib oil ducts inconspicuous.
Perennial herb. Flowering stems up to 0.45 m high; erect, slender, softly hairy. Leaves often absent in flowering stage, basally blade simple, ovate-cordate, ternate, upwards becoming pinnately divided. Flowers: white; Feb., Mar. Fruit compressed, black with greenish ribs when ripe.