Franco Banfi / Arctic comb jelly / Sea nut (Mertensia ovum) swimming in front of iceberg. Tasiilaq, East Greenland. April.

Adrian Davies / Oyster plant (Mertensia maritima), Hillswick, Shetland, Scotland, UK. June 2018.

Adrian Davies / Oyster plant (Mertensia maritima) and Sea campion (Silene uniflora) on shingle beach, Hillswick, Shetland, Scotland, UK. June 2018.

Adrian Davies / Oyster plant (Mertensia maritima), Hillswick, Shetland, Scotland, UK. June 2018.

Adrian Davies / Oyster plant (Mertensia maritima), Hillswick, Shetland, Scotland, UK. June 2018.

Olga Kamenskaya / Arctic Comb Jelly (Mertensia ovum) Svalbard, Norway, September.

Robin Chittenden / Oysterplant (Mertensia maritima) Iceland June

Bernard Castelein / Oysterleaf (Mertensia maritima) on rocky beach of Island Runde, Norway, July

Bernard Castelein / Oysterleaf (Mertensia maritima) on rocky beach of Island Runde, Norway, July

Bernard Castelein / Oysterleaf (Mertensia maritima) on rocky beach of Island Runde, Norway, July

Mike Read / Narrowleaf bluebells (Mertensia lanceolata) in alpine meadow near Mount Washburn, The Grand Loop, Yellowstone National Park, Wyoming USA June

Chris Mattison / Oyster plant (Mertensia maritima) Shetlands, Scotland, UK, June.

Tim Fitzharris / Indian Paintbrush (Castilleja miniata) and Mountain Bluebells (Mertensia ciliata) flowering, American Basin, Colorado

MYN / Clay Bolt / Virginia Bluebell (Mertensia virginica) flower, Southern Appalachians, South Carolina, United States, March. Meetyourneighbours.net project

Laurie Campbell / Oyster plant (Mertensia maritima) flowering on shingle beach, Morayshire, Scotland, June

Robert Thompson / Tullagh Point, Malin Peninsula, County Donegal, Republic of Ireland, July 2007, Oysterplant {Mertensia maritima} growing in foreground.

Robert Thompson / Oysterplant {Mertensia maritima} Tullagh Point, Malin Peninsula, County Donegal, Republic of Ireland, July

Robert Thompson / Oysterplant {Mertensia maritima} growing through stones on beach, Tullagh Point, Malin Peninsula, County Donegal, Republic of Ireland, July

Robert Thompson / Oysterplant {Mertensia maritima} Tullagh Point, Malin Peninsula, County Donegal, Republic of Ireland, July

Scott Leslie / Comb Jelly (Mertensia ovum) with tentacles spread to catch prey, Nova Scotia, Canada

Scott Leslie / Comb Jelly (Mertensia ovum) with tentacles spread to catch prey, Nova Scotia, Canada

Scott Leslie / Comb Jelly (Mertensia ovum) with tentacles spread to catch prey, Nova Scotia, Canada

Scott Leslie / Comb Jelly (Mertensia ovum) with tentacles spread to catch prey, Nova Scotia, Canada

Hermann Brehm / Mountain bluebell {Mertensia ciliata} flowering amongst rocks, Glacier NP, Montana, USA

Norbert Wu / Comb Jelly (Mertensia ovum) feeds on krill; digests it rapidly within transparent gut

Norbert Wu / Comb Jelly (Mertensia ovum) with tentacles withdrawn to lick clean, Arctic

Norbert Wu / Comb Jelly (Mertensia ovum) tentacles splayed to catch prey, Arctic

Norbert Wu / Comb Jelly (Mertensia ovum) feeds on krill which is digested rapidly within transparent gut, Arctic

Tim Fitzharris / Mountain Bluebell (Mertensia ciliata) and Groundsel (Senecio sp) flowering on mountain, American Basin, Colorado

Niall Benvie / Oysterplant growing amongst pepples {Mertensia maritima} Scotland UK

David Welling / Oysterplant {Mertensia maritima} Hesketh Is Alaska.

Jeff Foott / Colorado Blue Columbine (Aquilegia caerulea), Splitleaf Indian Paintbrush (Castilleja rhexifolia) and Mountain Bluebell (Mertensia ciliata) flowers, Colorado