Wild Wonders of Europe / Hermans / Melancholy thistle (Cirsium heterophyllum) flowers, Cliffs of Moher, County Clare, Republic of Ireland, June 2009

MYN / Niall Benvie / Melancholy thistle (Cirsium helenioides / Cirsium heterophyllum) in flower, Scotland, UK, June

Ernie Janes / Melancholy thistles (Cirsium helenioides) flowering, Norfolk, UK, May

Ernie Janes / Melancholy Thistle (Cirsium helenioides) and Buttercups (Ranunculus sp) flowering in meadow, UK

Andy Sands / Melancholy thistles (Cirsium helenioides) growing on roadside verge, Upper Teesdale, Co. Durham, England, UK, June 2009

Andy Sands / Melancholy thistle (Cirsium helenioides) close up of flower, Upper Teesdale, Co. Durham, England, UK, June

Andy Sands / Elephant Hawk Moth (Deilephila elpenor) at rest on Melancholy thistle, Co Durham, England, UK

Andy Sands / Wildflower meadow, typical Upper Teesdale meadow with Melancholy thistle, meadow sweet and many more flowers with upland farm beyond, County Durham, UK, April 2008

Nick Garbutt / Melancholy thistle (Cirsium heterophyllum) Isle of Mull, Scotland, UK.

Gary K. Smith / Swallowtail Butterfly {Papilio machaon ssp britannicus} feeding on Melancholy thistle, with windmill and habitat in background, Norfolk Broads, UK, June

Gary K. Smith / Swallowtail Butterfly {Papilio machaon ssp britannicus} feeding on Melancholy thistle, Norfolk Broads, UK, June

Gary K. Smith / Melancholy Thistles {Cirsium helenioides} growing in damp meadowland, Norfolk, UK, June

Geoff Simpson / Melancholy thistle (Cirsium helenioides) UK

Geoff Simpson / Melancholy thistle in flower {Cirsium helenioides} Derbyshire, UK.

Duncan Mcewan / Portrait of a Melancholy thistle {Cirsium helenioides} UK

Paul D Stewart / Illustration of the extinct Falkland Island Wolf or Fox (Dusicyon australis). Hand coloured lithograph, Plate IV, The Zoology of the Voyage of H.M.S. Beagle, edited and superintended by Charles Darwin...