Which genus has more species, Echium or Ptilotus?
Echium: Echium is a genus of 60 species of flowering plant in the family Boraginaceae. Ptilotus: Ptilotus R.Br. Ptilotus:  is a genus of approximately 110 species of annual and perennial herbs and shrubs in the family Amaranthaceae. Ptilotus:  Poir., also occurs in Tasmania and another, "Ptilotus conicus" R.Br., in Malesia on the islands of Flores and Timor. Ptilotus:  In family-level phylogenetic studies, "Ptilotus" has been placed within a clade informally known as the 'aervoids'.
i don't know