Dahlia coccinea is a species in the genus Dahlia, family Asteraceae. Common name is "red dahlia" although the flowers can be orange or occasionally yellow as well as the more common red. The species is native to Mexico but has long been cultivated in other countries for its showy flowers.

Can we draw the following conclusion?
Dahlia coccinea is the only Dahlia species native to Mexico. 

OPT:
(I) Yes.
(II) It's impossible to say.
(III) No.
(II)