Oxalic Acid
Oxalix acid, in the leaves
Rhubarb leaves contain poisonous substances including oxalic acid
Thought to be of Chinese origin
yes so is rubarb
Rubarb stem
yes so is rubarb
Rhubarb is a strong laxative
Yes they can and its delicious.
I would not risk it - there are plenty of other things to try. Rhubarb contains oxalic acid which is moderately toxic - the leaves are too toxic for humans to eat but we can cope with the quantity in the stems.
radish, rubarb, raisin
Rhubarb can be eaten raw but is most commonly cooked or stewed.
Chlourous acid