Galeopsis (weeds)

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Galeopsis ladanum (click on image to enlarge it)
Author(s): Jacob Sturm
Source: Wikimedia Commons

Galeopsis (weeds) L.

This genus of herbaceous plants includes around 15 species that are mainly found in Europe and Asia. Hemp-nettle (Galeopsis tetrahit) has been introduced into North America and is an important agricultural weed, affecting cereals and other crops.

The plants of Galeopsis can reach a height of up to 1 m. The leaves are simple and the stems have a square cross-section. The flowers are white, yellow or reddish. Unlike most other species of the mint family (Lamiaceae) Galeopsis species rarely produce essential oils.

Type species: Galeopsis tetrahit

Currently, the following species have been entered into the system: