Plural form of blueheart; people with sorrowful or melancholic dispositions, or a plant with blue flowers.
From 'blue' + 'hearts'; either referring to sad-spirited people or to plants (like certain Commelina species) characterized by blue coloring in their flowers or blooms.
In Victorian times, people literally used plant names like 'blueheart' to convey emotions—giving someone a blueheart plant was a coded way of expressing sadness or longing.
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