Calibrachoa are the smaller but close relatives to Petunia. However, on closer examination it has been found that there are major differences in chromosomes, corresponding to external differences and fertilisation factors that distinguish the two genera. Calibrachoa is named after Antonio de la Cal y Bracho, a 19th century Mexican botanist and pharmacologist.
This post is part of the Nature Footsteps Floral Macros meme,
and also part of the Ruby Tuesday meme.