Aristolochia baetica 2 near El Madroñal, Andalusia, Spain 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia baetica 3 near El Madroñal, Andalusia, Spain 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia baetica 5 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clematitis 1 Västra Vram Sk 090603 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clusii 1 Sicily 190418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clusii 2 Sicily 190418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clusii 3 Sicily 190418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clusii 4 Sicily 190418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clusii 5 Sicily 190418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clusii 6 Sicily 190418 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia cretica 1 Pereli, Crete 110327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fimbriata 1 Lund Bot Garden 130816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fimbriata 2 Lund Bot Garden 130816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fimbriata 3 Lund Bot Garden 130816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fontanesii 3 Hoces del Rio Duratón near Sepúlveda SP 140505 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia grandiflora 1 Lund Bot Garden 090826 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia hirta 1 S of Agiasos, Lesbos, Greece 100513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia hirta 2 S of Agiasos, Lesbos, Greece 100513 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia hirta 3 NW of Alanya, Turkey 090407 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 1 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 2 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 4 Lund Bot Garden 150727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 5 Lund Bot Garden 150727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 6 Lund Bot Garden 150727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 7 Lund Bot Garden 150727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia lycica 1 NW of Seki, Alanya, Turkey 090410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia lycica 3 NW of Seki, Alanya, Turkey 090410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia lycica 4 NW of Seki, Alanya, Turkey 090410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia pontica northeastern Turkey 2015 - Photo: Patricia Cardet (© 2014 Jan Thomas Johansson).

Aristolochia baetica 1 Gibraltar GB 120321 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia baetica 4 near El Madroñal, Andalusia, Spain 120320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia baetica 6 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia baetica 7 Cantarriján beach near Málaga, Andalucía Spain 220410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia bianorii 1 Soller Jardin Botanico, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia bianorii 2 Soller Jardin Botanico, Mallorca 110419 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clematitis 2 Helsingborg Sk 130601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clematitis 3 Västra Vram Sk 090603 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia clematitis 4 (cult) Brunnby Sk 120828 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia cretica 2 Pereli, Crete 110327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fontanesii 1 Hoces del Rio Duratón near Sepúlveda SP 140505 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fontanesii 2 Hoces del Rio Duratón near Sepúlveda SP 140505 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fontanesii 4 Hoces del Rio Duratón near Sepúlveda SP 140505 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fontanesii 5 Hoces del Rio Duratón near Sepúlveda SP 140505 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia fontanesii 6 Hoces del Rio Duratón near Sepúlveda SP 140505 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia gigantea Lund Bot Garden 090826 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia grandiflora 2 Lund Bot Garden 090826 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia labiata 3 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia lycica 2 NW of Seki, Alanya, Turkey 090410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia macrophylla 1 Lund Bot Garden 130603 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia macrophylla 2 (cult) Lund Sk 080515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia macrophylla 3 (cult) Lund Sk 080515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia macrophylla 4 Lund Bot Garden 130603 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia macrophylla 5 Lund Bot Garden 130603 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia macrophylla 6 (cult) Lund Sk 080515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Aristolochia rotunda N Polygyras, Greece 050526 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).