Thunbergia alata 1 Bergianska, Stockholm 050922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia alata 2 Copenhagen Bot Garden 140515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia alata 3 Copenhagen Bot Garden 140515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia alata 4 La Guïra Nat Park, Cuba 190319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia alata 5 La Guïra Nat Park, Cuba 190319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia cf grandiflora 4 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia erecta 1 San Diego de Los Baños, Cuba 190319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia fragrans 1 San Diego de Los Baños, Cuba 190319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia fragrans 2 San Diego de Los Baños, Cuba 190319 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia cf grandiflora 3 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia cf vogeliana Bergianska, Stockholm 020425 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia grandiflora 1 Lund Bot Garden 120911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia grandiflora 2 Lund Bot Garden 120911 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia mysorensis 1 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia mysorensis 2 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Thunbergia mysorensis 3 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).