tithonia
noun
ti·tho·nia tə-ˈthō-nyə 
tī-,
-nē-ə
: any of a genus (Tithonia) of tall composite herbs or shrubs of Mexico and Central America that have flower heads resembling sunflowers and that are sometimes grown as ornamentals
Word History
Etymology
New Latin, probably from Latin Tithonia, poetic name of Aurora
First Known Use
1940, in the meaning defined above