Galeopsis tetrahit; The Common Hemp-nettle is an introduced weedy species on Iceland. One can find it only near human settlements. It is an annual species. Galeopsis species have flowers with rather large lateral lobes on which two humps are situated at the base of these lateral lobes. This trait differentiate the species/genus from deadnettles (Lamium). Characteristic for all members of the mint family are the square stems and the typical flower-shape.
It is a member of the mint family (Lamiaceeae). The Icelandic name of this species is Garðahjálmgras.