Which flower is the most invasive and found in more countries than the other, Rhodanthe or Tansy?
Rhodanthe: Rhodanthe, also known as sunray or pink paper daisy, is a genus of Australian plants in the pussy's-toes tribe within the daisy family. Tansy: Tansy ("Tanacetum vulgare") is a perennial, herbaceous flowering plant of the aster family, native to temperate Europe and Asia. Tansy:  It has been introduced to other parts of the world including North America, and in some areas has become invasive.
Tansy