Johns Island, also spelled John's Island, is an island in Charleston County, South Carolina, United States, and is the largest island in the state of South Carolina.
 Johns Island is bordered by the Wadmalaw, Seabrook, Kiawah, Edisto, Folly, and James islands; the Stono and Kiawah rivers separate Johns Island from its border islands.
 It is the fourth largest island on the US east coast, surpassed only by Long Island, Mount Desert Island and Martha's Vineyard.
 Johns Island is 84 sqmi in area, with a population of 21,500 people.
Kadavu (pronounced ] ), with an area of 411 km2 , is the fourth largest island in Fiji, and the largest island in the "Kadavu Group", a volcanic archipelago consisting of Kadavu, Ono, Galoa and a number of smaller islands in the Great Astrolabe Reef.
 Its main administrative centre is Vunisea, which has an airport, a high school, a hospital, and a government station, on the Namalata Isthmus where the island is almost cut in two.
 Suva, Fiji's capital, lies 88 km to the north of Kadavu.
 The population of the island province was 10,167 at the most recent census in 2007.
Mappia racemosa is a species of plant in the Icacinaceae family.
 It is found in Cuba, the Dominican Republic, Guatemala, Haiti, Jamaica, Panama, and Puerto Rico.
 It is threatened by habitat loss.
Kodiak Island (Alutiiq: "Qikertaq", Russian: Кадьякъ ) is a large island on the south coast of the U.S. state of Alaska, separated from the Alaska mainland by the Shelikof Strait.
 The largest island in the Kodiak Archipelago, Kodiak Island is the second largest island in the United States and the 80th largest island in the world, with an area of 9311.24 km2 , slightly larger than Cyprus.
 It is 160 km long and in width ranges from 10 to .
 Kodiak Island is the namesake for Kodiak Seamount, which lies off the coast at the Aleutian Trench.
 The largest community on the island is the city of Kodiak, Alaska.
Princess Royal Island is the largest island on the North Coast of British Columbia, Canada.
 It is located amongst the isolated inlets and islands east of Hecate Strait on the British Columbia Coast.
 At 2251 km2 , it is the fourth largest island in British Columbia.
 Princess Royal Island was named in 1788 by Captain Charles Duncan, after his sloop, the "Princess Royal".
Erromango is the fourth largest island in the Vanuatu archipelago.
 With a land area of 891.9 km² it is the largest island in Tafea Province, the southernmost of Vanuatu's six administrative regions.
Jamaica ( ) is an island country situated in the Caribbean Sea, consisting of the third-largest island of the Greater Antilles.
 The island, 10,990 sqkm in area, lies about 145 km south of Cuba, and 191 km west of Hispaniola (the island containing the countries of Haiti and the Dominican Republic).
 Jamaica is the fourth-largest island country in the Caribbean, by area.
Groote Eylandt is the largest island in the Gulf of Carpentaria and the fourth largest island in Australia.
 It is the homeland of, and is owned by, the Warnindhilyagwa who speak the isolated Anindilyakwa language.
Orust is an island in western Sweden, and Sweden's third largest island.
 In 2014 Statistics Sweden declared it to instead be the fourth largest island, under a definition which adds artificial canals to the possible bodies of water surrounding an island.
 It has been noted that under this definition, all of Götaland would be the country's largest island, rendering Orust instead the fifth largest.
 The largest town on Orust is Henån, where approximately 1,800 inhabitants live.
 Orust is home to approximately 15,160 inhabitants in the winter and many more in the summer.
Dominica is an island in the Caribbean Sea, located about halfway between the French islands of Guadeloupe (to the north) and Martinique (to the south).
 Its coordinates are 15 25 N, 61 20 W.
 It is known as "The Nature Island of the Caribbean" due to its spectacular, lush, and varied flora and fauna, which is protected by an extensive natural park system.
 It is the fourth largest island in the Eastern Caribbean with a population of people mainly from African descent.

Question: Which family does Mappia racemose, which grows on the fourth largest island in the Caribbean? 
Answer: Icacinaceae family