Any plant with dark-colored parts, or specifically a folk name for certain medicinal herbs with dark stems, leaves, or roots.
From 'black' + 'wort' (Old English for plant), a traditional naming convention for plants distinguished by dark coloration, common in herbalism and folk medicine.
The '-wort' suffix tells us about ancient plant classification—figwort, liverwort, mugwort all have dark features, and herbalists could identify medicinal plants by these visible characteristics!
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