To get back to the shape of the leaves, if they have a mnemonic layer one thing they always reminded me of is shipping amphorae (typically for wine).
Of course these are Bronze Age vessels and I don't know if their shape would still be relevant ca. 1430. Or, more likely, if the peculiarly shaped leaf base might be supposed to bring to mind a different kind of container.
Again according to the wiki for Nuphar lutea, "the common name 'brandy bottle' is derived from the aroma produced by the flowers which is similar to stale alcohol."
Of course these are Bronze Age vessels and I don't know if their shape would still be relevant ca. 1430. Or, more likely, if the peculiarly shaped leaf base might be supposed to bring to mind a different kind of container.
Again according to the wiki for Nuphar lutea, "the common name 'brandy bottle' is derived from the aroma produced by the flowers which is similar to stale alcohol."