Paul Harcourt Davies / Spring Crocus (Crocus vernus) in flower in snow, Campo Imperatore, Gran Sasso, Appennines, Abruzzo, Italy, May

Marie Read / Purple Crocus (Crocus angustifolius) flowers emerging through snow in early spring, New York, USA.

Kerstin Hinze / Crocus (Crocus napolitanus) flowering in spring garden at Schlosspark Husum, Schleswig-Holstein, Germany

Kerstin Hinze / Crocus (Crocus napolitanus) flower, Schlosspark Husum, Schleswig-Holstein, Germany

Heather Angel / Solitary bee (Apoidea) feeding on Crocus (Crocus korolkowii), covered in pollen. Ansob Pass, Tajikistan. April.

Heather Angel / Celandine crocus (Crocus korolkowii) carpets in areas of snowmelt. Near Ansob Pass, Tajikistan. April 2014.

Heather Angel / Celandine crocus (Crocus korolkowii) carpet in area of snowmelt. Pollinated by solitary bees and bumblebees. In valley, near Ansob Pass, Tajikistan. April 2014.

Konrad Wothe / Crocus (Crocus vernus) flowering in Upper Bavaria with Karwendel mountains in distance, Germany, April.

Bruno D'Amicis / Crocuses (Crocus vernus) emerging from decaying wood in old-growth Beech forest. Abruzzo, Lazio and Molise National Park / Parco Nazionale d'Abruzzo, Lazio e Molise UNESCO World Heritage Site Ital...

Juan Carlos Munoz / Crocus (Crocus sp) flowers, Miera Valley, Valles Pasiegos, Cantabria, Spain.

Erlend Haarberg / Spring crocus (Crocus heuffelianus) flowering, Retezat National Park, Transylvania, Romania. May.

Kerstin Hinze / Crocus (Crocus sp), flowering, cultivated plant in Westfalenpark, Dortmund,, Germany, March.