This family contains buckwheat, sorrel (but not wood sorrel[?]), rhubarb, and knotgrass[?]. It is named for the shape of the seed; that of rhubarb, for example, has a triangular cross-section.
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... has existed all throughout human history, and probably pre-dates the emergence of effective medicine.
Quackery is still abundant today, herbal medicine[?], miracle cures, ...