Bistorta 3 Baimashan, Yunnan (A-C Rudolphi) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta amplexicaulis 1 Shika, Yunnan 110712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta amplexicaulis 2 Shika, Yunnan 110712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta amplexicaulis 3 Shika, Yunnan 110712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta orientalis 4 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta orientalis 5 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta tenuicaulis 1 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta tenuicaulis 2 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 6 Lake Helen, Kangerlussuaq, Greenland 140703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta 1 Dali, Yunnan 110706 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta 2 NW of Shangri-la, Yunnan 110708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 1 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 2 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 3 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 4 (cult) Väsby Sk 160604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 5 (cult) Väsby Sk 160604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 6 (cult) Väsby Sk 160604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 7 (cult) Väsby Sk 160604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 8 (cult) Väsby Sk 160604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta affinis 9 (cult) Väsby Sk 160604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta cf affinis 1 Lund Bot Garden 070625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta cf affinis 2 Lund Bot Garden 070625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta cf emodii ssp dependens Yunnan 1107 - Photo: Unknown (© 2014 Jan Thomas Johansson).

Bistorta major 1 Osby, Skåne 960712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta major 2 Zdiar, Slovakia 950629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta major 3 between Villar d'Arène and Col du Lautaret FR 150707 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 1 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 2 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 3 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 4 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 5 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 6 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 7 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 8 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta officinalis 9 (cult) Klippan Sk 140531 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta orientalis 1 Shika, Yunnan 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta orientalis 2 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta orientalis 3 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta tenuicaulis 3 Göteborg Bot Garden 130524 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 1 Riksgränsen, Torne Lappmark 830725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 10 Nohlmarken, Skultorp, Västergötland 140529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 11 Nohlmarken, Skultorp, Västergötland 140529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 12 Nohlmarken, Skultorp, Västergötland 140529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 2 Kopparåsen, Torne Lappmark 110727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 3 Kopparåsen, Torne Lappmark 110727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 4 Lullihatjårro, Torne Lappmark 110728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Bistorta vivipara 7 Nohlmarken, Skultorp, Västergötland 140529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 8 Nohlmarken, Skultorp, Västergötland 140529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Bistorta vivipara 9 Nohlmarken, Skultorp, Västergötland 140529 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).