I use whatever parsley looks the freshest at the grocery store. I have used curled leaf and Italian parsley.
By the way, you should just pour the boiling water over the parsley and let it steep. I reviewed the recipe I had. My original post was wrong. It has been a long time since I made it.
There should be several posts about parsley tea on Curezone. It is one of Barefoot's favorite herbs for kidney detox.