Dryas integrifolia 1 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 11 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 12 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 2 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 3 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 4 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 5 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 1 Schlossalm, Austria 080703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 10 Lullihatjårro, Torne Lappmark 110728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 11 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 13 Col d'Izoard FR 150709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 14 Col d'Izoard FR 150709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 15 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 16 Burren Nat Park, Clare, Ireland 170528 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 2 Schlossalm, Austria 080703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 3 Ansätten, Jämtland 090704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 4 Ansätten, Jämtland 090704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 5 Lullihatjårro, Torne Lappmark 110728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 6 Lullihatjårro, Torne Lappmark 110728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 8 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 9 Lullihatjårro, Torne Lappmark 110728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 10 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 6 Store Saltsö, Kangerlussuaq, Greenland 140708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 7 Store Saltsö, Kangerlussuaq, Greenland 140708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 8 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas integrifolia 9 Kangerlussuaq, Greenland 140628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 12 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dryas octopetala 7 Lullihatjårro, Torne Lappmark 110728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).