Included here is the tropical lowlands and shores of Mexico and all other parts of Central America south of Mexico including Guatemala, Honduras, San Salvador, Nicaragua, Costa Rica and much of Panama. Also included are the Revilla Gigedo Islands.
Of the endemic and near endemic vascular plants so far recorded here there are about 3817 species in 974 genera and 182 families. There is 29 endemic genera (marked red) and four endemic or near endemic families (Guamatelaceae, Haptanthaceae, Plocospermataceae and Ticodendraceae). Of the remaining families Caryocaraceae, Cyclanthaceae, Heliconiaceae, Marcgraviaceae, Muntingiaceae, Picramniaceae and Schlegeliaceae are exclusive to the neotropics, Alstroemeriaceae is confined to Central and South America, Brunelliaceae is confined to the Andes, Venezuela, Central America and the Antilles, Humiriaceae is exclusively neotropical except for one species found in tropical West Africa, and Lacistemataceae is found in the West Indies and Central America and throughout much of South America.
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