Leonurus cardiaca ssp cardiaca 6 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 7 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 8 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 12 near Merkine, Lithuania 150806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 7 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 8 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus sibiricus 4 Bergianska 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 1 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 10 Lilla Karlsö, Gotland 910726 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 2 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 3 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 4 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 5 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp cardiaca 9 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 1 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 10 near Merkine, Lithuania 150806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 11 near Merkine, Lithuania 150806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 13 near Merkine, Lithuania 150806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 2 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 3 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 4 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 5 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 6 Rakvere, Estonia 100708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus cardiaca ssp villosus 9 Ultuna, Uppland 050911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus sibiricus 1 Bergianska 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus sibiricus 2 Bergianska 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Leonurus sibiricus 3 Bergianska 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).