Hibiscus (Pavonia strictiflora) 3 Puerto de la Cruz Bot Garden, Tenerife 160410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus 1a Limahuli Garden, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus 1b Limahuli Garden, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus 2b Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arboreus 2 Puerto de la Cruz Jardín Bot, Tenerife 090515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 1 Manoa Cliff Trail, Tantalus, Oahu, Hawaii 130709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 2 Manoa Cliff Trail, Tantalus, Oahu, Hawaii 130709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 3 Manoa Cliff Trail, Tantalus, Oahu, Hawaii 130709 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 4 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 5 Foster Botanical Garden, Honolulu, Hawaii 130706 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 6 Foster Botanical Garden, Honolulu, Hawaii 130706 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arnottianus 7 Foster Botanical Garden, Honolulu, Hawaii 130706 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus brackenridgei (cult) Waimea Falls Park, Oahu, Hawaii 840229 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus calyphyllus 1 (cult) Waimea Falls Park, Oahu, Hawaii 840229 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus calyphyllus 2 (cult) Waimea Falls Park, Oahu, Hawaii 840229 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf brackenridgei 1 eastern coast of West Maui, Hawaii 130717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf brackenridgei 2 eastern coast of West Maui, Hawaii 130717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf brackenridgei 3 eastern coast of West Maui, Hawaii 130717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf brackenridgei 4 eastern coast of West Maui, Hawaii 130717 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf kahikii 1 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf kahikii 2 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus cf kahikii 3 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus clayii 3 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus clayii 4 University of Hawaii, Manoa, Honolulu, Hawaii 130707 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus elatus 2 (cult) Playa Larga, Zapata, Cuba 190316 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus hastatus var pubescens 1 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus hastatus var pubescens 2 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus hastatus var pubescens 3 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus kokio 1 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus kokio 2 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus kokio ssp kokio National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus kokio ssp saintjohnianus National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus pedunculatus 1 Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus pedunculatus 2 Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus pedunculatus 3 Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus pedunculatus 4 Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus pedunculatus 5 Lund Bot Garden 140422 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Hibiscus splendens 1 Puerto de la Cruz Jardín Bot, Tenerife 090515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus splendens 2 Puerto de la Cruz Jardín Bot, Tenerife 090515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus syriacus 2 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus syriacus 3 (cult) Höllviken Sk 060813 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus tiliaceus 1 (cult) Lahaina, West Maui, Hawaii 130721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus tiliaceus 2 (cult) Lahaina, West Maui, Hawaii 130721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus tiliaceus 3 (cult) Lahaina, West Maui, Hawaii 130721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus tiliaceus 4 (cult) Lahaina, West Maui, Hawaii 130721 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus trionum 10 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 11 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 13 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 14 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 2 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus trionum 4 Bergianska, Stockholm 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 6 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 7 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 8 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 9 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus waimeae ssp hannerae 2 Limahuli Garden, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus waimeae ssp waimeae 1 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus waimeae ssp waimeae 2 Copenhagen Bot Garden 130913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus (Pavonia strictiflora) 1 Puerto de la Cruz Bot Garden, Tenerife 160410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus (Pavonia strictiflora) 2 Puerto de la Cruz Bot Garden, Tenerife 160410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus 2a Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arboreus 1 Puerto de la Cruz Jardín Bot, Tenerife 090515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arboreus 3 Puerto de la Cruz Jardín Bot, Tenerife 090515 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arboreus 4 Puerto de la Cruz Bot Garden, Tenerife 160410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus arboreus 5 Puerto de la Cruz Bot Garden, Tenerife 160410 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus elatus 1 (cult) Playa Larga, Zapata, Cuba 190316 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus kokio 3 Lyon Arboretum, Honolulu, Hawaii 130708 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Hibiscus rosa-sinensis (cult) La Gomera 060424 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus schizopetalus 1(cult) La Ensenada Lodge, Costa Rica 231206 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus schizopetalus 2 (cult) La Ensenada Lodge, Costa Rica 231206 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 12 Kallerup grusgrav, Copenhagen DK 140922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus trionum 5 Bergianska, Stockholm 060916 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Hibiscus waimeae ssp hannerae 1 Limahuli Garden, Kauai, Hawaii 130712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).