Herbaceous erect perennial, glabrous, commonly highly ramified. Alternate leaves, ovate to deltoid, up to 30 cm, pinnate compound, with filiform divisions; petiole pods 3-10 cm in length. Inflorescence in umbels with many flowers, up to 12 cm in diameter; yellow petals. Fruit oblong, glabrous, slightly compressed, with acute and equal ribs.

This species is confused with Anethum graveolens, which has a shorter petiolar sheath and narrowly winged fruit ribs, the 2 lateral ones being wider.

Trees, up to 40 m high.  Stem erect; bark smooth, scaly.  Leaves simple, alternate, aromatic.

Many species were introduced into North and South America and almost all of them are used in traditional medicine.  Furthermore, hybridization has occurred between the different species which makes identification difficult.  Therefore, no detailed description is provided for a species.

Highly-branched shrub, erect from 1 to 3 m, terete, striated, puberulent to glabrous stems. Opposite leaves, ovate to ovate- lanceolate, trinerved from the base, up to 15 cm, irregularly serrated margins. Capitula in terminal corymbs of up to 10 cm wide; blue or white flowers. Ribbed columnar achenes.

Perennial herb, glabrous, up to 60 cm Lanceolate to oblanceolate leaves up to 30 cm long, crenate to finely spiny serrated, thinned at the base forming a short, winged petiole. Inflorescences in dichasia, extensively ramified with green- yellowish capitula; involucral bracts, lanceolate leaflets, extending beyond the capitula. Globose fruit, laterally compressed, densely scaly. 

Annual erect herb, 0.5-2 m in height, with simple or highly ramified stems in the upper part, more or less pilose. Alternate leaves, lanceolate to ovate-lanceolate, 5-10 (-30) cm long and up to 8 cm wide, irregularly dentate or rarely pinnately lobed margins; lower leaves with winged petioliform base, the central and sessile apical ones, embracing the stem.

Perennial plant with thick roots. Thick cylindrical culms, up to 1 m high, hollow, septate. Cylindrical spikelets, up to 5 cm, with many flowers; subcartilaginous, veined, obovate or oblong glumes with scarious margins; stamens 3, style 2 to 3 divided. Biconvex, yellow, brown or grey achenes.