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.
Pyrethrum Pyrethrum was a genus of several Old World plants now classified as "Chrysanthemum" or "Tanacetum" (e.g., "C. coccineum") which are cultivated as ornamentals for their showy flower heads. Pyrethrum continues to be used as a common name for plants formerly included in the genus "Pyrethrum". Pyrethrum is also the name of a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium and Chrysanthemum coccineum.