Dracocephalum moldavicum 12 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum moldavicum 13 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Dracocephalum moldavicum 7 Lund Bot Garden 080612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 1 Gösslunda, Hulterstad, Öland 730618 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 10 Villmanstrand (Lappeenranta) castle, southern slope FI 120730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 11 Villmanstrand (Lappeenranta) castle, southern slope FI 120730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 14 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 15 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 16 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 4 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 5 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 7 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum wendelboi 1 Göteborg Bot Garden 120628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum wendelboi 2 Göteborg Bot Garden 120628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum cf imbricatum 1 Shika, Yunnan 110712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum cf imbricatum 2 Shika, Yunnan 110712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum cf imbricatum 3 Shika, Yunnan 110712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Dracocephalum moldavicum 10 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum moldavicum 11 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Dracocephalum moldavicum 5 Lund Bot Garden 080610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum moldavicum 6 Lund Bot Garden 080612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum moldavicum 8 Lund Bot Garden 080612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum moldavicum 9 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 2 Gösslunda, Hulterstad, Öland 730618 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 3 Nolgården, Näs, Västergötland 870704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 4 Nolgården, Näs, Västergötland 870704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 5 Nolgården, Näs, Västergötland 870704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 6 Nolgården, Näs, Västergötland 870704 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 7 Lund Bot Garden 120615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 8 Lund Bot Garden 120615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum ruyschiana 9 Lund Bot Garden 120615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 1 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 12 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 13 Copenhagen Bot Garden 140625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 2 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 3 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 6 Daugavpils stn, Latvia 100712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 8 Villmanstrand (Lappeenranta) castle, southern slope FI 120730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum thymiflorum 9 Villmanstrand (Lappeenranta) castle, southern slope FI 120730 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum wendelboi 3 Göteborg Bot Garden 120628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Dracocephalum wendelboi 4 Göteborg Bot Garden 120628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).