challenge: What is the origin and meaning of the name 'Ageratina'?
  
  A. Derived from Greek, meaning 'evergreen'
  B. Derived from Greek, meaning 'un-aging', in reference to the flowers keeping their color for a long time
  C. Derived from Latin, meaning 'flower of the sun'
  D. Derived from Latin, meaning 'western flower'
  Answer: 