Phil Savoie / Bitteroot (Lewisia rediviva) Beaverhead National Forest, Montana, USA, June.

Ernie Janes / Siskiyou lewisia (Lewisia cotyledon) flowers, cultivate plant native to New Zealand.

Guy Edwardes / Roseroot (Sedum rosea) Mangrt Pass, Julian Alps, Slovenia. June 2008

Kevin Schafer / Oregon Bitter-root (Lewisia rediviva) flowers, Cascade Mountains, Washington

Olga Kamenskaya / Roseroot stonecrop (Rhodiola rosea) flowers, Vaygach Island, Arctic, Russia, July

Robin Chittenden / Roseroot (Rhodiola rosea) viewed from directly above, Iceland June

Niall Benvie / Roseroot (Rhodiola rosea) growing on cliffs, Lunga, Scotland, UK, May.

Philippe Clement / Golden root (Rhodiola rosea) in flower, Gran Paradiso National Park, Italy, June

Adrian Davies / Roseroot (Rhodiola rosea) Torridon, Scotland, June.

Alex Hyde / Rose-root (Rhodiola rosea) growing on sea cliff, Isle of Lunga, Treshnish Isles, Scotland, June.

Alex Hyde / Rose-root (Rhodiola rosea) growing on sea cliff, Isle of Lunga, Treshnish Isles, Scotland, June.

Adrian Davies / Rose root (Rhodiola rosea) in flower, Shetland Islands, Scotland, UK, May.