# Removing legend box (border) in pgfplots

I'm attempting to remove or 'turn off' the legend border in pgfplots, but I can't seem to figure out how to do it. I assume it will look something like this:

\begin{axis}[ legend style={?}]


where ? is a property related to the legend border (or box) that I can't seem to find. The pgfplots help is really great, but I haven't seen this addressed anywhere. Does anyone know how to accomplish this simple task?

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to turn off the border around filled areas (a related question), there is a bug with the draw=none option. See tex.stackexchange.com/questions/99861/… – PatrickT Oct 1 '15 at 6:09

\begin{axis}[ legend style={draw=none}]