Ageratum littorale
 Ageratum littorale common name Cape Sable Whiteweed is a plant species native to Florida the common name referring to Cape Sable inside Everglades National Park. Some publications (e. g. Flora of North America) consider this as being the same species as the West Indian A. maritimum but The Plant List accepts the two as distinct taxa. It is their lead that we are following here.