I bought some herb seedlings on the weekend, one of them being Pennyroyal. Doing a google search on pennyroyal brings up two different looking types. One has a more mint like appearance, the other one has smaller, rounder looking leaves and the plant looks like it grows closer to the ground, it's the latter type that i've purchased.
My question is, are they interchangeable? Does the information about uses for pennyroyal apply to both types?