Alex Hyde / Jacob's Ladder (Polemonium caeruleum) flowering. Lathkill Dale NNR, Peak District National Park, UK, June.

Ole Jorgen Liodden / Boreal Jacobs-ladder (Polemonium boreale) in front dark mountains. Spitsbergen, Svalbard, July.

Wild Wonders of Europe / Liodden / Boreal jacobs ladder (Polemonium boreale) flowers, Spitsbergen, Svalbard, Norway, June 2009

Geoff Simpson / Jacobs ladder flower - pink form {Polemonium caeruleum}. Peak District, Derbyshire, UK

Geoff Simpson / Jacob's ladder {Polymonium caeruleum} UK Lathkill Dale NNR, Derbyshire dales

Geoff Simpson / Jacob's ladder flower {Polymonium caeruleum} Lathkill Dale NNR, Derbyshire dales UK

Alex Hyde / Jacob's Ladder (Polemonium caeruleum) flowering. Lathkill Dale National Nature Reserve, Peak District National Park, UK, June.

Bryan and Cherry Alexander / Boreal Jacob's Ladder (Polemonium genus). Svalbard, Norway, June.

Philippe Clement / Jacob's ladder flower (Polymonium caeruleum), Belgium

Wild Wonders of Europe / Liodden / Boreal jacobs ladder (Polemonium boreale) in flower, Spitsbergen, Svalbard, Norway, June 2009

Oriol Alamany / Jacob's ladder (Polemonium sp) flowers in the arctic tundra, Saint Paul Island, Pribilof Islands, Alaska, USA

Paul Hobson / Jacobs ladder {Polemonium caeruleum} flowers, Peak District, UK.

Paul Hobson / Jacobs ladder {Polemonium caeruleum} in flower, Peak District, UK.

Paul Hobson / Jacobs ladder {Polemonium caeruleum} in flower, Peak District, UK.

Paul Hobson / Jacobs ladder {Polemonium caeruleum} in flower, Peak District, UK.

Martin Gabriel / Jacob's ladder flower {Polemonium caeruleum} Germany

Pascal Tordeux / Jacob's Ladder (Polemonium caeruleum). Picardy, France, May.