Pellitory of the wall

Parietaria officinalis
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Rosales
Family:	Urticaceae
Genus:	Parietaria
Species:	P. officinalis
Binomial name
Parietaria officinalis L.

Parietaria officinalis, the eastern pellitory-of-the-wall, also known as upright pellitory and 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.

The pollen is a cause of allergy.

It was once used in the making of certain metheglins.

The leaves and flowers of P. officianlis contains the flavonoids kaempferol-3-bioside, the 3-glucosides and 3-rutinosides of quercetin, kaempferol and isorhamnetin, 3-sophorosides of quercetin and kaempferol and 3-neohesperosides of kaempferol and isorhamnetin. They also contains caffeoylmalic and two pyrrole acids.

It is in a different family from Anacyclus pyrethrum, also called pellitory.

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Wikipedia