Small tree with a single stem, rarely ramified, leafy at the top. Large leaves of 20 to 60 cm, usually palmate, 7-lobed. Male staminate flowers in panicles of 10 cm or more; female flowers with yellow corolla, spiral petals. Globose or subglobose fruit up to 30 cm in diameter, yellow or orange, with milky juice; numerous black seeds.

Shrub or tree of 3 to 10 m. Leaves obovate to elliptical or ovate, 6.5 to 16 cm long and 3 to 8 cm wide, with trichomes on the upper and lower side, persistent or deciduous. Flowers arranged in 6 to 20 cm long inflorescences, pseudo-racemose; revolute sepals, sericeous adaxially and tomentose abaxially; yellow petals turning orange or red with age. Fruit in the form of drupes from 1 to 1.5 cm in diameter, glabrous green and yellow when ripe.

Biennial herbaceous. Root typically globose or elongated, outer colour white, white with purple or yellowish. Almost no stem before it flowers. Leaves up to 30 cm long, glaucous, sometimes lyrate. Inflorescence stem with lobed leaves. Flowers with 4 yellow petals, arranged in corymbose clusters.

Upright herbaceous plant up to 1.7 m high, glabrous and glaucous. Alternate, oblong to obovate leaves up to 35 cm, tripinnate with the last filiform segments; petiole pods 1-3 cm long. Inflorescences with terminal and lateral umbels; numerous flowers with yellow petals. Fruit ovate-elliptic, glabrous, up to 4 mm long, compressed dorsally, narrowly winged ribs, the 2 lateral ones are broader.

This species is often confused with Foeniculum vulgare, which has a longer petiole pod and all the ribs of the fruit are the same.

Annual plant, very aromatic, erect, up to 2 m in height, covered with long hairs. Alternate or opposite bipinnatifid leaves, 3 to 10 cm in length. Greenish male flowers in long terminal buds, female flowers in leaf axils. Fruit in ovoid, angular and thorny achenes, 3 to 4 mm in length.

Shrub or small tree of up to 9 m, very ramified. Alternate leaves, ovate, from 8 to 20 cm, acuminate, cordate at the base, entire. Inflorescence in terminal panicles; flowers 4 to 5.3 cm in diameter; pink or white petals, obovate to broadly oval. Capsule (fruit) ovoid to globular-ovoid, 3 to 4 cm, usually with soft spines. Seeds with a red aril.