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

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

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

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

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

Kadua affinis Puu Kaua, Hawaii 840226 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 1 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 10 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 11 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 12 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 5 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 6 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 7 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 8 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 9 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 1 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 2 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 3 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 4 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 5 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 6 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua laxiflora 7 Olinda Rare Plant Nursery, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua littoralis 3 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua littoralis 4 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua littoralis 5 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua littoralis 6 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua littoralis 7 Maui Nui Botanical Garden, Kaluhui, Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua sp nov 1b National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua sp nov 1c National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua sp nov 1d National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

Kadua st.-johnii 2 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua st.-johnii 4 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

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

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

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

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

Kadua centranthoides 13 Olinda Endangered Plant Facility, East Maui, Hawaii 130718 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 2 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 3 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua centranthoides 4 Kilauea Iki, Big Island, Hawaii 130725 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

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

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

Kadua sp nov 1a National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Kadua st.-johnii 3 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).