12. Onosmodium Michx. (false gromwell)
About 7 species,
North America.
An interesting
characteristic of Onosmodium species that has resulted in
underestimation of perianth size in some floristic accounts is that the flowers
tend to appear precociously fertile. That is, the style becomes long-exserted
from the bud and the stamens shed their pollen before the corolla has become
fully enlarged (Al-Shehbaz, 1991).