Two plants, holy thistle (Silybum marianum) and Canada thistle (Cirsium arvense): flowering and fruiting stems. Coloured etching by C. Pierre, c. 1865, after P. Naudin.
- Naudin, Philibert, active 1870.
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The holy or milk thistle, on the left, was used medicinally to protect liver from hepatitis, now known to contain flavonoids effective as antidotes to Amanita poisoning