Which genus contains more species, Calendula or Heliotropium?
Calendula: Calendula ( ), is a genus of about 15–20 species of annual and perennial herbaceous plants in the daisy family Asteraceae that are often known as marigolds. Heliotropium: Heliotropium is a genus of flowering plants in the borage family, Boraginaceae. Heliotropium:  There are 250 to 300 species in this genus, which are commonly known as heliotropes (sg.
Heliotropium