A couple of months ago i was contacted by Dr Lena Struwe, an associate professor and the director of the Chrysler Herbarium at Rutgers University in the USA. She had found my blog while researching weeds and the symbolism of dandelions in contemporary popular culture. We have emailed a couple of times and she's written details about her research looking at the evolutionary biology of weeds - it's fascinating. Lena also sent a few items for the Dandelion Archive: the image here shows an advert from a magazine.
The poor dandelion! Being used as a metaphor for cancer. The unwanted weed in an otherwise perfect lawn. "The challenge is to identify and attack the genetic flaws of each cancer". I suppose as a marketing idea it's saying what the company intended - but it isn't helping the negative reputation the dandelion continues to have.