Accidentally created a branch called --track, and now I can't delete it

So I ran this command:

git checkout -b --track origin/RB_1.4.5

I thought that it would create a local branch by the same name and set it up to track the remote branch, but instead it created a branch called --track. I could have sworn that omitting the local branch name will normally cause it to assume you want the same name as the remote branch, but I guess this wasn't the case.

Now running:

git branch

gives me:

* --track
  master

I've tried checking out master and then running:

git branch -D --track  (as well as "--track")

but that doesn't do anything (no errors or anything).

I tried removing the corresponding lines in .git/config, but still no dice.

How can I remove that branch? Also, in the future, is there a way to do what I wanted and still not have to re-type the local branch name?