Between Leitneria and Zinnia, which genus is more widely spread?
Leitneria: Leitneria floridana (corkwood), the sole species in the genus Leitneria, is a deciduous dioecious shrub or small tree, found only in the southeastern United States states of Arkansas, Florida, Georgia, Missouri and Texas. Zinnia:  They are native to scrub and dry grassland in an area stretching from the Southwestern United States to South America, with a centre of diversity in Mexico.
i don't know