Stinging nettle – Urtica dioica

Stinging nettle foliage & flowers

Stinging nettle foliage & flowers

Hair on stem of stinging nettle

Hair on stem of stinging nettle

Stinging nettle leaf

Stinging nettle leaf

Stinging nettle seedling

Stinging nettle seedling

Stinging nettle stem

Stinging nettle stem

Stinging nettle

Urtica dioica L.
Urticaceae (Nettle family)

Life cycle
Erect, rhizomatous perennial.

Leaves
Opposite, egg- to lance-shaped with a rounded base and pointed tip. Petiolated leaves have coarsely toothed margins, smooth surfaces to a few hairs beneath and long, stinging hairs on the lower surface. Contact with stinging hairs can cause a skin irritation.

Stems
Four-angled, herbaceous stems are usually erect and unbranched, up to 6 feet tall and covered with stinging hairs. Contact with stinging hairs can cause a skin irritation.

Flowers and fruit
Inconspicuous, green to yellow flowers are formed in clusters in the upper leaf axils. The seed is enclosed in a single-seeded, tan, egg-shaped fruit.

Reproduction
Seeds and rhizomes that form extensive colonies.