What is "scleranthus"

Scleranthus, the knawels, are a genus of herbaceous plants in the carnation family.

Scleranthus has been listed as one of the 38 plants used to prepare Bach flower remedies, a kind of alternative medicine promoted for its effect on health. However according to Cancer Research UK, "there is no scientific evidence to prove that flower remedies can control, cure or prevent any type of disease, including cancer".