Polygonaceae family(Rheum rhaponticum)
Polygonaceae family
Rhubarb is a perennial, native to Asia, and is grown primarily for its red petioles, which are used to impart a tart flavor to pies and other desserts. It is actually in the same family as buckwheat. The leaf blades contain oxalic acid and are thus poisonous. Rhubarb does not tolerate hot temperatures well, and it needs cold winters to break dormancy.