Alex Hyde / Fairy's thimble (Campanula cochleariifolia) with Saxifrage flowers (Saxifraga squarrosa) below, on limestone cliff face. Triglav National Park, Julian Alps, Slovenia. July.

Sven Zacek / Purple saxifrage (Saxifraga oppositifolia) growing on lichen covered rocks, in a fjord, Svalbard, Spitsbergen, Norway. June.

Pal Hermansen / Sprouts of Purple saxifrage (Saxifraga oppositifolia) on white background.

Bryan and Cherry Alexander / Flowering Purple saxifrage (Saxifraga oppositifolia) and frost shattered rocks in Krossfjorden, Svalbard, Norway.

Eric Baccega / Purple mountain saxifrage (Saxifraga oppositifolia) flowering on Devon Island, Nunavut, Canada, August

Eric Baccega / Purple mountain saxifrage (Saxifraga oppositifolia) flowering on Devon Island, Nunavut, Canada, August

Paul Harcourt Davies / Purple saxifrage (Saxifraga oppositifolia) on rock face. Dolomites, Italy. June.

Paul Harcourt Davies / Purple saxifrage (Saxifraga oppositifolia). Dolomites, Italy. June.

Paul Harcourt Davies / Purple saxifrage (Saxifraga oppositifolia) flowers cascading across rocks. The Sella, Dolomites, Italy. June.

Paul Harcourt Davies / Purple saxifrage (Saxifraga oppositifolia) growing amongst rocks at 2900m. Dolomites, South Tyrol, Italy.

Steve Nicholls / Purple saxifrage (Saxifraga oppositifolia) Cwm Idwal, Snowdonia, Wales, UK.