Are both Nigella and Leucanthemella both plants?
Nigella Nigella is a genus of 18 species of annual plants in the family Ranunculaceae, native to southern Europe, north Africa, south and southwest Asia. Common names applied to members of this genus are nigella, devil-in-a-bush or love-in-a-mist.
Helenin Helenin is a phytochemical mixture found in many plant species, including the "Inula helenium" (elecampane) of the Asteraceae family. It is a mixture of two isomeric sesquiterpene lactones, alantolactone and isoalantolactone.