Southern United States, the West Indies, Mexico, Central America and South America. Spreading beyond its native range as a weed.
Map of select IRC data for peninsular Florida
SOUTH FLORIDA Occurrence:
SOUTH FLORIDA Native Status:
Although we have treated this as non-native in the past, this was collected in Key West by Ferdinand Rugel between 1842 and 1849 and on an island in Estero Bay (probably Mound Key) by A.P. Garber in 1878. There are other early collections from shell mounds and coastal uplands from the Flamingo area in Everglades National Park northwest to Charlotte Harbor. Although weedy, it appears that this is a native componant of our flora, at least from Key West to Charlotte Harbor. It may have spread as a weed elsewhere from there.
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U. fusca var. reticulata, U. fasciculata var. reticulata.