Arnica angustifolia 4 Torne Lappmark, Luopakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia 5 Torne Lappmark, Luopaakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia 6 Torne Lappmark, Luopakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia 7 Torne Lappmark, Luopakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 1 Battfjellet, Svalbard 790718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 11 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 12 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 13 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 3 Battfjellet, Svalbard 790718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 7 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica cf sachalinensis 1 Lund Bot Garden 090708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica cf sachalinensis 2 Lund Bot Garden 090708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica chamissonis 1 Ekorrbäcken, Tärendö, Norrbotten 220717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica chamissonis 2 Ekorrbäcken, Tärendö, Norrbotten 220717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica chamissonis 4 Ekorrbäcken, Tärendö, Norrbotten 220717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica chamissonis 5 Ekorrbäcken, Tärendö, Norrbotten 220717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica longifolia 1 Bergianska 050621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica longifolia 2 Bergianska 050621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica montana 1 Våxtorp Hl 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica montana 2 Våxtorp Hl 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica montana 4 Halland 120612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica montana 5 Våxtorp Hl 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica montana 6 Våxtorp Hl 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica rydbergii 1 Göteborg Botanical Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia 1 Torne Lappmark, Luopakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia 2 Torne Lappmark, Luopakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia 3 Torne Lappmark, Luopakte 110730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 10 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 2 Battfjellet, Svalbard 790718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 4 Mt Hassel, Kangerlussuaq, Greenland 140630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 5 Mt Hassel, Kangerlussuaq, Greenland 140630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 6 Mt Hassel, Kangerlussuaq, Greenland 140630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 8 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica angustifolia ssp alpina 9 Tacan, Kangerlussuaq, Greenland 140629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica chamissonis 3 Ekorrbäcken, Tärendö, Norrbotten 220717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica montana 3 Våxtorp Hl 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica rydbergii 2 Göteborg Botanical Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica rydbergii 3 Göteborg Botanical Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Arnica rydbergii 4 Göteborg Botanical Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).