Robin Chittenden / Eurasian Siskin (Carduelis spinus) perched on Stinging nettle (Urtica dioica), Ceredigion, Wales, UK. August.

Edwin Giesbers / Barn swallow (Hirundo rustica) perched on nettle, The Netherlands

Will Watson / Nettle clustercup rust fungus (Puccinia urticata) induced gall on Common nettle (Urtica dioica), Westhope Common, Herefordshire, England, UK, May.

Doug Wechsler / Cecropia trees (Cecropia sp) subtropical cloud forest, Tapichalaca Reserve, Ecuador.

Laurie Campbell / Peacock butterfly (Inachis io) larva feeding on stinging nettle, Berwickshire, Scotland, July 2008

Laurie Campbell / Peacock butterfly (Inachis io) larva feeding on stinging nettle, Berwickshire, Scotland, July 2008

Kim Taylor / Stinging hairs on a Nettle (Urtica dioica) stem. Surrey, England. Digital composite.

MYN / Dirk Funhoff / Red admiral (Vanessa atalanta) pupa attached to a Stinging nettle (Urtica dioica) leaf, Lorsch, Hessen, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Common nettle (Urtica dioica), Lorsch, Hessen, Germany. June. Meetyourneighbours.net project

MYN / Dirk Funhoff / Red admiral butterfly (Vanessa atalanta) pupa on stinging nettle (Urtica dioica), Lorsch, Hessen, Germany. August. Meetyourneighbours.net project

Doug Wechsler / Cecropia trunk (Cecropia sp) Province El Oro, Buenaventura Biological Reserve, Ecuador

Nick Upton / Mountain nettle / Ortigon de los Montes (Gesnouinia arborea), a Canaries endemic, flowering in montane laurel forest, Anaga Rural Park,Tenerife, May.