Flowers can be white, pink or yellowish, with purple markings on the un-notched lower lip. Calyx is very bristly. Leaves oval, toothed, hairy. Stems are branched, erect and bristly-hairy. Height: 10-80cm.
Found on arable land, waste ground, hedge banks and disturbed road verges.
Similar: Bifid Hemp-nettle, G. bifida.
Photographs above: Ballingeary, Co.Cork. August 2007