What's the difference between rampion and tampion?

Rampion

Definition:

(n.) A plant (Campanula Rapunculus) of the Bellflower family, with a tuberous esculent root; -- also called ramps.

Example Sentences:

Definition:

(n.) A wooden stopper, or plug, as for a cannon or other piece of ordnance, when not in use.
(n.) A plug for upper end of an organ pipe.

Example Sentences:

(1) The protein-binding assay developed by Brown, Albano, Ekins, Sgherzi & Tampion [(1971) Biochem.