From rudbeckia to echinacea: the emergence of the purple cone flower in modern therapeutics.

@article{Flannery1999FromRT,
  title={From rudbeckia to echinacea: the emergence of the purple cone flower in modern therapeutics.},
  author={Marty Flannery},
  journal={Pharmacy in history},
  year={1999},
  volume={41 2},
  pages={52-9}
}