Mentha aquatica 1 Tueholmssöen, Tåstrup, Sjaelland DK 130811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha aquatica 2 Mölle fälad, Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha aquatica 3 Tofta, Gotland 070802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha aquatica 4 Tofta, Gotland 070802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha aquatica 5 Tofta, Gotland 070802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha aquatica 7 SE of Vallby, Kyrkheddinge Sk 140820 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 1 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 2 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 3 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 4 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 5 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 6 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 7 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha arvensis 8 Skanör Sk 130901 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha cf spicata 2 Komposteringsanlaeg, Selinevej, Kalvebod Faelled, Copenhagen 131017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha cf spicata 5 Komposteringsanlaeg, Selinevej, Kalvebod Faelled, Copenhagen 131017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 10 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 11 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 2 Landön, Trolle-Ljungby, Skåne 940813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 3 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 4 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 5 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 9 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha requenii 1 Lund Bot Garden 160909 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha requenii 2 Lund Bot Garden 160909 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha requenii 3 Lund Bot Garden 160909 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 4 Lund Bot Garden 160721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 10 N of Lendrup Huse, Loegstoers kommune, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 11 N of Lendrup Huse, Loegstoers kommune, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 12 N of Lendrup Huse, Loegstoers kommune, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 13 N of Lendrup Huse, Loegstoers kommune, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 4 Toftagården, Tofta, Gotland 070804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 5 Toftagården, Tofta, Gotland 070804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 6 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 7 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 8 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 9 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x piperita 3 Höllviken Sk 120812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha aquatica 6 Tofta, Gotland 070802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha cf spicata 1 Komposteringsanlaeg, Selinevej, Kalvebod Faelled, Copenhagen 131017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha cf spicata 3 Komposteringsanlaeg, Selinevej, Kalvebod Faelled, Copenhagen 131017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha cf spicata 4 Komposteringsanlaeg, Selinevej, Kalvebod Faelled, Copenhagen 131017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 1 Landön, Trolle-Ljungby, Skåne 940813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 6 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 7 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia 8 Copenhagen Bot Garden 160713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia x suaveolens 1 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia x suaveolens 2 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha longifolia x suaveolens 3 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 1 Ultuna, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 2 Ultuna, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 3 Ultuna, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 5 Lund Bot Garden 160721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 6 Lund Bot Garden 160721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 7 Lund Bot Garden 160721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata 8 Lund Bot Garden 160721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata x suaveolens 1 Selinevej, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata x suaveolens 2 Selinevej, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata x suaveolens 3 Selinevej, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha spicata x suaveolens 4 Selinevej, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 1 Toftagården, Tofta, Gotland 070804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 2 Toftagården, Tofta, Gotland 070804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 3 Toftagården, Tofta, Gotland 070804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 6 Stora Råby, Lund, Skåne 950923 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 7 Stora Råby, Lund, Skåne 950927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 8 Stora Råby, Lund, Skåne 950927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha suaveolens 9 N of Lendrup Huse, Loegstoers kommune, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 1 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 2 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 3 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 4 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis 5 Bredavik, Blekinge 110813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis cv 'hirtella' Kvarnbäcken, E of Helsinki FI 120728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis var verticillata 1 Edstippen, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis var verticillata 2 Edstippen, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x gracilis var verticillata 3 Edstippen, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x piperita 1 Höllviken Sk 120812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Mentha x piperita 2 Höllviken Sk 120812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).