Chris Mattison / Wall pennywort (Umbilicus rupestris) growing on the wall surrounding Tintern Abbey, Monmouthshire, Wales

Linda Pitkin / Navelwort / Wall pennywort (Umbilicus rupestris), in wooded area, coast path near Jennycliff, near Plymouth, Devon, England, July.

Linda Pitkin / Navelwort / Wall pennywort (Umbilicus rupestris), in wooded area, Jennycliff, near Plymouth, Devon, England, July.

Alex Hyde / Navelwort / Wall Penntwort (Umbilicus rupestris) Devon, UK. June.

Alex Hyde / Navelwort / Wall Penntwort (Umbilicus rupestris) and English stonecrop (Sedum anglicum) flowerinig on an exposed cliff face. Devon, UK. June.

Gary K. Smith / Navelwort / Wall Pennywort {Umbilicus rupestris} growing on drystone wall, Somerset, UK, May

Gary K. Smith / Navelwort / Wall Pennywort {Umbilicus rupestris} growing on drystone wall, Somerset, UK, May

Gary K. Smith / Navelwort / Wall Pennywort {Umbilicus rupestris} growing on drystone wall, Somerset, UK, May

Adrian Davies / Wall Penntwort / Navelwort (Umbilicus rupestris) growing in old wall. Achill Island, County Mayo, Ireland

Adrian Davies / Wall Pennywort / Navelwort (Umbilicus rupestris) growing in old wall. Achill Island, County Mayo, Ireland

Dave Bevan / Wall pennywort {Umbilicus rupestris} growing on stone wall, Pembrokeshire, Wales, UK

Jose B. Ruiz / Wall pennywort {Umbilicus rupestris} Spain

Tony Evans / Wall pennywort / Navelwort {Umbilicus rupestris} with spider. UK

Tony Evans / Wall pennywort / Navelwort {Umbilicus rupestris} with spider. UK

Nigel Cattlin / Navelwort Rust (Puccinia umbilici) showing teleutosori of the rust on a Navelwort leaf (Umbilicus rupestris). England, UK.

Robert Thompson / Navelwort / Wall pennywort (Umbilicus rupestris) flowering in stone wall, Saltee Islands, County Wexford, Ireland, June