Assertion: russian comfrey | /r/HasProperty | s. uplandicum
Facets:
Source sentences:
text: Since a chemical in isolation behaves differently than when present in a whole plant, rats are different than humans, and it is unclear whether common comfrey (S. officinale) or Russian comfrey (S. uplandicum) was used, there is dissension among herbalists regarding this decision and whether comfrey is indeed toxic.