A rare native species in my country, so I'm glad to find it in my garden.
Pellitory-of-the-wall (Parietaria officinalis), also known as lichwort, is a plant of the nettle family. Its leaves, however, are non-stinging. The plant grows on rubbish and on walls, hence the name. It was once used as a medicinal herb and in the making of certain metheglins.
