Helianthus annuus 2 (cult) Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus annuus Bergianska 030811 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus atrorubens 2 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus atrorubens 4 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus atrorubens 5 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus atrorubens 6 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus crassilentus 2 Oak Park, CA 130410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus crassilentus 3 Oak Park, CA 130410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus decapetalus 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus decapetalus 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus decapetalus 3 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus decapetalus 6 Kallerup Grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus giganteus 2 Lund Bot Garden 140924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus hirsutus 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus hirsutus 3 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus maximilianii 2 Lund Bot Garden 120927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus mollis 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus mollis 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus mollis 3 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus niveus 2 Algodones Dunes, California 130420 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 1 Arrie Sk 160919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 2 Arrie Sk 160919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 2 Kallerup Grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 3 Arrie Sk 160919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 3 Kallerup Grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 4 Arrie Sk 160919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 4 Kallerup Grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 5 Arrie Sk 160919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus salicifolius 2 Lund Bot Garden 121016 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus salicifolius 3 Lund Bot Garden 121016 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus strumosus 2 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus strumosus 3 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus tuberosus 1 Skarpnäck, Stockholm 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus tuberosus 2 Skarpnäck, Stockholm 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus annuus 1 (cult) Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus annuus 3 (cult) Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus atrorubens 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus atrorubens 3 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus crassilentus 1 Oak Park, CA 130410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus decapetalus 4 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus decapetalus 5 Kallerup Grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus giganteus 1 Lund Bot Garden 140924 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus grosseserratus 1 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus grosseserratus 2 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus hirsutus 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus maximilianii 1 Lund Bot Garden 120927 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus niveus 1 Algodones Dunes, California 130420 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus niveus 3 Algodones Dunes, California 130420 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus niveus 4 Algodones Dunes, California 130420 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus pauciflorus 1 Kallerup Grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus rigidus Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus salicifolius 1 Lund Bot Garden 121011 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus strumosus 1 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus strumosus 4 Copenhagen Bot Garden 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Helianthus tuberosus 3 Lilla Nyby, Eskilstuna, Södermanland 030914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).