Mint, pennyroyal and crosne

Mint, pennyroyal and crosne

My husband and I bought our first house less than two years ago. Last year, I noticed some sort of mint popping up.... well, everywhere. I pulled, and pulled. I tried Googling to identify what mint it could be, possibly save one and pot it up. I came to the amateur conclusion that could be pennyroyal. I was pregnant at the time, and immediately stopped pulling it. When I miscarried, having handled pennyroyal made my list of possible reasons. Suffice it to say, I didn't get it all up last year. It's back with a vengeance this year. I was out pulling after a night of rain recently. It was coming up easily, but I noticed that there are these weird little tubers below ground. I don't remember them last year, but perhaps I didn't pull under the right conditions. What's growing in my yard *looks* like pennyroyal, in as much as my amateur eye can distinguish one member of the mint family from another, from the ground up. The pictures I've found of the above ground growth of crosne doesn't look as much like what's growing here. But then there's the tubers. Googling "crosne picture".... that's what I pulled up. I've never grown mint, so I have no comparison for what the rhizome should or shouldn't look like and my google-fu is failing me. Short of taking a sample to my state agriculture school (I will if I have to), I'm at a loss to identify it. If it's a potentially yummy volunteer, it can stay and be harvested come fall. If it's poisonous, it's got to go. I know pics are usually helpful in IDing stuff. I just don't have any. My ex-MIL bought me no less than 6 cameras in as many years, and I lost or broke all of them.
View from the couch

View from the couch

Bulb identification

Bulb identification

Butterfly Tales…

Butterfly Tales…

Wild plant ID?

Wild plant ID?

powdery mildew?

powdery mildew?

I’m so proud!

I’m so proud!