I've seen this referred to as 'giant rhubarb' if for no other reason than it looks like giant rhubarb. However, I've also come across a couple of references that state that the plant is edible. I search but have found no real evidence that this is the case, and no recipes either.

Does anyone know if this plant (any part of it) is actually edible, or is it more likely that some folks have just misinterpreted the common name and think it is an edible relation of Rhubarb?

I'm hoping to get a science-based answer here, from someone who actually knows what toxins make it inedible, or can directly confirm that it is edible (and which parts, and what quantity is safe to eat). Failing that, what scientific resource would you suggest I follow up with (maybe a reference for an edibility expert at some national university? I'm not even sure where to find experts in this field).

Thank you!

Keith