Lactuca perennis 2 Moneval NE of Grenoble FR 150705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca perennis 3 Moneval NE of Grenoble FR 150705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 3 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 4 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 5 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 6 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca quercina 2 (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca quercina 3 (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca quercina 5 (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 5 Lund Sk 120818 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 8 Lund Sk 120818 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca sibirica 1 Rantasalmi, Järvisydän FI 120731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca sibirica 5 Rantasalmi, Järvisydän FI 120731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 11 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 2 Tvärminne FI 120803 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 3 Tvärminne FI 120803 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 4 Tvärminne FI 120803 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 6 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 7 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 8 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 9 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tuberosa 3 Kovan Kaya Natural Monument, Bulgaria 120511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tuberosa 4 Kovan Kaya Natural Monument, Bulgaria 120511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca virosa 1 Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca virosa 2 Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca virosa 3 Rio Clarillo Nat Park, Chile 171104 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca perennis 1 Moneval NE of Grenoble FR 150705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 1 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 2 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca plumieri 7 Chamrousse FR 150703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca quercina 1 Lilla Karlsö, Gotland 910727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca quercina 4 (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 1 Lund Sk 120818 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 2 Lund Sk 120818 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 3 Lund Sk 120818 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 4 Skanör Sk 130809 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 6 Skanör Sk 130809 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca serriola 7 Lund Sk 120818 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca sibirica 2 Rantasalmi, Järvisydän FI 120731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca sibirica 3 Rantasalmi, Järvisydän FI 120731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca sibirica 4 Rantasalmi, Järvisydän FI 120731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 1 Tvärminne FI 120803 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 10 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 12 Gnisvärd, Tofta, Gotland 140829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tatarica 5 Holmhällar, Sundre, Gotland 910729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tuberosa 1 Kovan Kaya Natural Monument, Bulgaria 120511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Lactuca tuberosa 2 Kovan Kaya Natural Monument, Bulgaria 120511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).