Rumex 1c Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosa var hydrophilus N Hobro, Jylland DK 090828 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 11 Sandflugtsdalen E Kangerlussuaq, Greenland 140702 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 12 Sandflugtsdalen E Kangerlussuaq, Greenland 140702 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 4 Höllviken Sk 130609 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 5 Höllviken Sk 130609 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 6 Skanör Sk 130609 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 5 Vanajaniemi N Hattula FI 120802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 6 Tromsøya, Troms, Norway 220719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bryhnii 3 Ölberg S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex cf hastatus Dali, Yunnan 110706 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 18 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 7 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 8 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 9 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crispus 3 Höllviken Sk 120717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crispus 4 Höllviken Sk 120717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex cristatus 2 Dadia, Thracia, Greece 060604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 8 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 1 Hawaii Volcanoes National Park, Big Island, Hawaii 130729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 3 Olinda Endangered Plant Facility, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 5 Olinda Endangered Plant Facility, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 8 Olinda Endangered Plant Facility, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 1 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 10 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 11 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 12 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 2 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 3 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 9 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 1 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 4 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 5 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 6 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 7 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex longifolius 4 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lunaria 1 Teno, Tenerife 090513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maderensis 1 Barranco Juan Mayor-Barranco Madera, La Palma 090424 (Richard Åkesson) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maderensis 3 W of Vaqueros SE of Santo Domingo de Garafia, La Palma 070417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 1 Hallands Väderö, Skåne 790902 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 10 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 2 Skanörs Ljung, Skåne 040727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 3 Skanörs Ljung, Skåne 040727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 4 Skanörs Ljung, Skåne 040727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 5 Eskilstorps ängar, Eskilstorp Sk 190806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 6 Eskilstorps ängar, Eskilstorp Sk 190806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 7 Eskilstorps ängar, Eskilstorp Sk 190806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 8 Eskilstorps ängar, Eskilstorp Sk 190806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 9 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex nepalensis 2 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex obtusifolius 8 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 12 Oljehamnen, Malmö Sk 220824 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 13 Oljehamnen, Malmö Sk 220824 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 5 Lund Sk 120930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 7 Lund Sk 121001 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 5 Lund Bot Garden 210725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 6 Lund Bot Garden 210725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 7 Lund Bot Garden 210725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pulcher 1 Molivos, Lesvos, Greece 130511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pulcher 4 Molivos, Lesvos, Greece 130511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pulcher 5 Molivos, Lesvos, Greece 130511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex salicifolius var triangulivalvis 4 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex salicifolius var triangulivalvis 5 (cult) Brunnby Sk 120828 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 3 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 4 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 5 Röddinge Sk 060809 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 6 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 7 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 1 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 3 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 4 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 6 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 7 SE of Mijas, Andalusia SP 120327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus ssp aetnensis 1 near Etna, Sicily 190419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus ssp aetnensis 2 near Etna, Sicily 190419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus ssp aetnensis 3 near Etna, Sicily 190419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus ssp aetnensis 4 near Etna, Sicily 190419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus ssp aetnensis 5 near Etna, Sicily 190419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus ssp aetnensis 6 near Etna, Sicily 190419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 1 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 3 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 4 Matala, Crete 110331 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 6 Miradór de San Pedro, Tenerife 160404 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 7 Miradór de San Pedro, Tenerife 160404 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 8 Miradór de San Pedro, Tenerife 160404 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex stenophyllus 1 Edstippen, Uppland 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex stenophyllus 2 Edstippen, Uppland 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex stenophyllus 3 Edstippen, Uppland 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex thyrsiflorus 4 Höllviken Sk 130622 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex thyrsiflorus 5 Höllviken Sk 130622 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex tuberosus 3 W of Mandra, Thracia, Greece 060605 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 1 Guancho Museum, Barranco de Fataga, Gran Canaria 080418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 10 Puertito de Güímar, Tenerife 160405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 5 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 6 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 7 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 8 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex 1a Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex 1b Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex 2a Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex 2b Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosa ssp acetosa 1 Höllviken Sk 130608 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosa ssp acetosa 2 Höllviken Sk 130608 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 1 Haleakala, Maui, Hawaii 130716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 10 Kangerlussuaq, Greenland 140705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 2 Haleakala, Maui, Hawaii 130716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 3 Haleakala, Maui, Hawaii 130716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 7 Kangerlussuaq, Greenland 140705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 8 Kangerlussuaq, Greenland 140705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex acetosella 9 Kangerlussuaq, Greenland 140705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 1 Nassfeld, Austria 080701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 2 Nassfeld, Austria 080701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 3 Nassfeld, Austria 080701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 4 Nassfeld, Austria 080701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 7 Tromsøya, Troms, Norway 220719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 8 Tromsøya, Troms, Norway 220719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex alpinus 9 Tromsøya, Troms, Norway 220719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex ambiguus 1 Sölvesborg, Blekinge 950527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex ambiguus 2 Sölvesborg, Blekinge 950527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex aquaticus 1 Ekebysjön, Danderyd, Uppland 030718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex aquaticus 2 Ekebysjön, Danderyd, Uppland 030718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex arifolius Tatranská Kotlina, Slovakia 950627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex balcanicus 1 Mt Voras (Kajmakcalan), N Greece 180701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex balcanicus 2 Mt Voras (Kajmakcalan), N Greece 180701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bryhnii 1 Ölberg S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bryhnii 2 Ölberg S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bryhnii 4 Sandvig, Bornholm DK 120603 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bucephalophorus 1 Kalloni Salt Pans, Lesvos, Greece 130506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bucephalophorus 2 Kalloni Salt Pans, Lesvos, Greece 130506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bucephalophorus 3 Kalloni Salt Pans, Lesvos, Greece 130506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex bucephalophorus 4 Kalloni Salt Pans, Lesvos, Greece 130506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex confertus 1 Sveaborg FI 120804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex confertus 2 Sveaborg FI 120804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex confertus 3 Sveaborg FI 120804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex confertus 4 Tallinn, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex confertus 5 Sveaborg FI 120804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 1 Bernstorp, Vellinge, Skåne 810823 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 10 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 11 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 12 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 13 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 14 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 15 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 16 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 17 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 19 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 2 Kolens kvarn, Visby, Gotland 980731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 20 Ängsbo, Vellinge Sk 150724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 3 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 4 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 5 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex conglomeratus 6 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crispus 1 Höllviken Sk 120718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crispus 2 Höllviken Sk 120717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex cristatus 1 Dadia, Thracia, Greece 060604 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 1 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 2 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 3 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 4 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 5 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 6 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex crystallinus 7 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 2 Hawaii Volcanoes National Park, Big Island, Hawaii 130729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 4 Hawaii Volcanoes National Park, Big Island, Hawaii 130729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 6 Hawaii Volcanoes National Park, Big Island, Hawaii 130729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex giganteus 7 Hawaii Volcanoes National Park, Big Island, Hawaii 130729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 4 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 5 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 6 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 7 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex graminifolius 8 Storfossen, Tana, Finnmark, Norway 220727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hastatus 1 between Benzilan and Baimashan, Yunnan 110710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hastatus 2 between Benzilan and Baimashan, Yunnan 110710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hastatus 3 between Benzilan and Baimashan, Yunnan 110710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hastatus 4 between Benzilan and Baimashan, Yunnan 110710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 2 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex hydrolapathum 3 Skanörs Ljung Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lativalvis 1 Contreberg Wild Flower Reserve, Darling, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lativalvis 2 Contreberg Wild Flower Reserve, Darling, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lativalvis 3 Contreberg Wild Flower Reserve, Darling, Western Cape, South Africa 100908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Rumex longifolius 3 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lunaria 2 Santa Cruz de La Palma, La Palma 070421 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lunaria 3 Miradór de San Pedro, Tenerife 160404 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lunaria 4 Miradór de San Pedro, Tenerife 160404 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex lunaria 5 Miradór de San Pedro, Tenerife 160404 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maderensis 2 Laguna de Barlovento 070417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maderensis 4 W of Vaqueros, SE of Santo Domingo de Garafia, La Palma 070417 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 11 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex maritimus 12 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex nepalensis 1 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex nepalensis 3 Bergianska 060620 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex nepalensis 4 Bergianska 060620 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex nepalensis 5 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Rumex obtusifolius 3 Lund Sk 121020 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex obtusifolius 4 Lund Sk 121020 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex obtusifolius 5 Lund Sk 121020 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex obtusifolius 6 Lund Sk 121020 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex obtusifolius 7 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex obtusifolius 9 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 1 Lund Sk 121001 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 10 Oljehamnen, Malmö Sk 220824 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 11 Oljehamnen, Malmö Sk 220824 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 2 Lund Sk 121020 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 3 Lund Sk 121020 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 4 Lund Sk 121001 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 6 Lund Sk 121001 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 8 Oljehamnen, Malmö Sk 220824 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex palustris 9 Oljehamnen, Malmö Sk 220824 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 1 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 2 Copenhagen Bot Garden 130611 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 3 Lund Bot Garden 210725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex patientia 4 Lund Bot Garden 210725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pseudonatronatus 1 Kasåkern Fi 120728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pseudonatronatus 2 Kasåkern Fi 120728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pseudonatronatus 3 Kasåkern FI 120728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pseudonatronatus 4 Kasåkern Fi 120728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pseudonatronatus 5 Kasåkern Fi 120728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pulcher 2 Molivos, Lesvos, Greece 130511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex pulcher 3 Molivos, Lesvos, Greece 130511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex salicifolius var triangulivalvis 1 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex salicifolius var triangulivalvis 2 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex salicifolius var triangulivalvis 3 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 1 Pålsjö, Helsingborg Sk 130813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex sanguineus 2 Röddinge Sk 060809 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 10 Parque Nacional de Monfragüe SP 140506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 11 Parque Nacional de Monfragüe SP 140506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 12 Parque Nacional de Monfragüe SP 140506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 13 Parque Nacional de Monfragüe SP 140506 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 2 near El Madroñal, Andalusia SP 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Rumex scutatus 8 near El Madroñal, Andalusia SP 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex scutatus 9 SE Mijas, Andalusia SP 120327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 2 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex spinosus 5 Matala, Crete 110331 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex thyrsiflorus 1 Höllviken Sk 130622 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex thyrsiflorus 2 Höllviken Sk 130622 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex thyrsiflorus 3 Höllviken Sk 120718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex tuberosus 1 Sanatorio-Xylocastro, Lesvos, Greece 100513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex tuberosus 2 Sanatorio-Xylocastro, Lesvos, Greece 100513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 2 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 3 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 4 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Rumex vesicarius 9 Puertito de Güímar, Tenerife 160405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).