The story
Probably related to genus Lunularia of liverworts, as lunularin has been derived from liverworts of other genera of class Marchantiopsida
Etymology from Wiktionary, CC BY-SA 4.0.
lunularin
Today it means: A dihydrostilbenoid found in many species of liverworts, as well as common celery, as well as the roots of Hydrangea macrophylla. Full definition →