Thalia geniculata, the bent alligator-flag,<ref>Template:PLANTS</ref> arrowroot,<ref name=GRIN>Template:GRIN</ref> or fire-flag,<ref name=GRIN/> is a plant species widespread across tropical Africa and much of the Americas.
Thalia geniculata is native to a large region in Africa, from Senegal in the west to Sudan in the east, south to Zimbabwe and Angola. It is also considered native to Mexico, Central America, the West Indies, most of South America, as well as the southeastern United States (Puerto Rico, Florida, Louisiana, Alabama and southern Georgia).<ref name="paulettewright"/><ref>Biota of North America Program, map, Thalia geniculata</ref>
Rosmarinic acid can be found in plants in the family Marantaceae such as Thalia geniculata.<ref>Occurrence of rosmarinic acid, chlorogenic acid and rutin in Marantaceae species. Yana Abdullah, Bernd Schneider and Maike Petersen, Phytochemistry Letters, 12 December 2008, Volume 1, Issue 4, Pages 199–203, Template:Doi</ref>