Assertion: skullcap | /r/MadeOf | duke 1992
Facets:
Source sentences:
text: Skullcap also contains an essential oil, lignin, resin, tannin, some miscellaneous alkanes, minerals such as calcium, potassium and zinc, as well as a wax (Newall et al 1996, 239; Duke 1992; Bergner 1997, 245).