Is the Legendary Super Saiyan (green) transformation limitless in power?
It seems entirely feasible for them to have an unlimited supply of ki. Perhaps while in that transformation, their bodies rapidly generate more and more ki until it just overflows. That however isn't the same thing as having limitless power. Just because you have infinite MP, doesn't mean that you can deal a lot of damage.

To answer your question, I'm not aware of the Daizenshuu mentioning it (nor any official source), but it is clear that the legendary super saiyan transformation is different than the normal transformation. Unlimited ki has appeared in Dragon Ball before too, Androids 17 &amp; 18 were stated to have such an ability. Thus, given the precedence and the dialogue we've seen in regards to the form, I can say with absolute certainty that the answer is "probably".