How to keep track of pip installed packages in an Anaconda (conda) env?

How to keep track of pip installed packages in an Anaconda (conda) env?

I've installed and been using the Anaconda python distribution, and have
started using the Anaconda (conda) envs. I can use the standard conda
install... command to put packages from the distribution into my
environments, but to use anything outside (i.e. Flask-WTF,
flask-sqlalchemy, alembic) I need to use pip install in the active env.
However, when I look at the contents of the env, either in the directory,
or using conda list these pip installed packages don't show up. And using
pip freeze and pip list just lists every package I've ever installed. Is
there a way to keep track of what is in each of my Anaconda envs (both pip
and conda installed)?
Thanks!