What's the difference between swallowwort and tetterwort?

Swallowwort

Definition:

• (n.) See Celandine.
• (n.) A poisonous plant (Vincetoxicum officinale) of the Milkweed family, at one time used in medicine; -- also called white swallowwort.

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Tetterwort

Definition:

• (n.) A plant used as a remedy for tetter, -- in England the calendine, in America the bloodroot.

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