Does Aronia or Hermannia have more species?
Hermannia Hermannia is a genus of flowering plants in the mallow family, Malvaceae. It comprises at least 65 species with many more species as yet unresolved.
Gustavia (plant) Gustavia is a genus of flowering plants of Lecythidaceae family described by Linnaeus in 1775. It is native to tropical Central America and South America. Many of the species are threatened; some are critically endangered "Gustavia superba", though, is actually abundant in re-growing secondary forests. It grows in northern South America, from Panama south through the Andes as far as Ecuador, and along the Caribbean coast and in the Amazon basin.