Citation: L., Sp. Pl. 983 (1753).

Derivation: Latin for the nettle.

Synonymy: Not Applicable

Common name: None

Description:
Erect or ascending annual or perennial herbs; leaves opposite, petiolate, toothed, covered by rigid stinging hairs which contain an irritating fluid, stipulate.

Flowers unisexual, small, green, subsessile, in elongate axillary inflorescences; male perianth of 4 equal segments; female of 2 outer and 2 larger inner segments; stigma penicillate, almost sessile.

Fruit a small glossy achene enclosed in the persistent perianth.

Distribution:  About 50 species mainly in temperate parts of the world. 1 species native to Australia. Nettles.

Biology: No text

Key to Species:

1. Perennial; leaves linear to narrowly lanceolate	U. incisa 1.
1. Annual; leaves broadly ovate to elliptic	U. urens 2.

Author: Not yet available