Not to nitpick. I just want people to realize there are actually recursive nets that rely on a parser to be built (this is the recursive net that relies on backpropagation through structure). Then there is the recurrent net (LSTMs,multimodal) that rely on backpropagation through time.

Talking to some of the users of Recursive nets, they will be renaming them to tree rnns which should help clear up confusion a bit.