dahl·ia 
(dălyə, däl-, dāl-)
(dălyə, däl-, dāl-)n.
Any of several tuberous-rooted plants of the genus Dahlia of the composite family, native to Mexico, Central America, and northern South America and cultivated for their showy, colorful flower heads.
[New Latin Dahlia, genus name, after Anders Dahl (1751-1787), Swedish botanist.]