Mertensia aff franciscana 1 Horsabäck Garden, Våxtorp Hl 130617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia aff franciscana 2 Horsabäck Garden, Våxtorp Hl 130617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia aff franciscana 3 Horsabäck Garden, Våxtorp Hl 130617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia aff franciscana 4 Horsabäck Garden, Våxtorp Hl 130617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia aff humilis 1 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia alpina var caelestina 1 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia alpina var caelestina 2 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia alpina var caelestina 4 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 2 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 3 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 4 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 5 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 6 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 7 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 8 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 1 Trosavik S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 2 Horsabäck Garden, Våxtorp Hl 130617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 3 Horsabäck Garden, Våxtorp Hl 130617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 4 Rörö, Göteborg 120715 (Lars-Eric Olsson) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 5 Brattfjell near Tromsø, Norway 220718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 6 Langfjordbotn, Finnmark, Norway 220720 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 7 Langfjordbotn, Finnmark, Norway 220720 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp maritima 8 Langfjordbotn, Finnmark, Norway 220720 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp tenella 1 Longyearbyen, Svalbard 790729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp tenella 2 Longyearbyen, Svalbard 790729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia maritima ssp tenella 3 Longyearbyen, Svalbard 790729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia virginica 1 Copenhagen Bot Garden 130516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia virginica 2 Copenhagen Bot Garden 130516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia virginica 3 Copenhagen Bot Garden 130516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia virginica 4 Copenhagen Bot Garden 130516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia aff virginica Flinck's Garden, Bjuv Sk 070521 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 1 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia echioides 9 Lund Bot Garden 150616 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mertensia virginica 5 Copenhagen Bot Garden 130516 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).