Ipomoea 1 Port Moresby University, Papua New Guinea 831103 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea 2a Rancho Belén, Cuba 190312 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea 2b Rancho Belén, Cuba 190312 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea acuminata La Gomera 060424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea batatas Lund Bot Garden 090327 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cairica 1 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf carnea 5 (cult) La Mira near Ifaty, Madagascar 191010 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf carnea 6 (cult) La Mira near Ifaty, Madagascar 191010 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf imperati 1 Honolulu Aquarium, Honolulu, Hawaii 130731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf imperati 2 Honolulu Aquarium, Honolulu, Hawaii 130731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea indica 1 Lund Bot Garden 140918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea indica 2 Lund Bot Garden 140918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea indica 3 Lund Bot Garden 140918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea indica 4 Lund Bot Garden 140918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 1 Lahaina, West Maui, Hawaii 130721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 2 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 3 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 4 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 5 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 6 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 7 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea pes-caprae 8 Haena Beach Park, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 1 Kipuka Puaulu, Kilauea, Big Island, Hawaii 130724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 2 Kipuka Puaulu, Kilauea, Big Island, Hawaii 130724 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 6 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 7 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea tricolor 2 Bergianska, Stockholm 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Ipomoea tricolor 4 Lund Bot Garden 120908 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea tricolor 5 Lund Bot Garden 080926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cairica 2 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf carnea 1 (cult) La Mira near Ifaty, Madagascar 191010 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf carnea 2 (cult) La Mira near Ifaty, Madagascar 191010 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf carnea 3 (cult) La Mira near Ifaty, Madagascar 191010 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea cf carnea 4 (cult) La Mira near Ifaty, Madagascar 191010 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea indica 5 Lund Bot Garden 140918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea lobata 1 Bergianska, Stockholm 010829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea lobata 2 Bergianska, Stockholm 010829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 3 Lund Bot Garden 070727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 4 Lund Bot Garden 070727 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea purpurea 5 Copenhagen Bot Garden 150812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea quamoclit 1 Bergianska, Stockholm 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Ipomoea quamoclit 2 Bergianska, Stockholm 060821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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