Rhubarb (Rheum) is a perennial, herbaceous plant with a height of 100-150 cm. In this genus are species such as rhubarb (Rheum rhabarbarum), English rhabonticum (Rheum rhaponticum) and whitish (Rheum ribes). Rheum ribes species is the only species that grows wild in Turkey. Leaves were collected at the bottom of the plant. The leaves are in the shape of a heart or kidney, 30lar60 cm in size, with toothed edges, veins dislodged from the lower face. The flowers were collected in a large compound cluster. The leaves are 6-part. Fruits are 10-30 cm long, reddish colored and winged. There is a meaty rhizome under the ground.

Rhubarb leaves contain poisonous substances. The leaves contain oxalic acid, which has a lethal and corrosive effect in many plants. The lethal dosage of pure oxalic acid is estimated to be 375 mg per kilogram of body weight or 25 g for a 65 kg human. Although the amount of oxalic acid in the leaves varies, this can be said to be 0.5%. This means that approximately 5 kg of leaf should be eaten in order to obtain a lethal dosage of oxalic acid, which is practically unlikely.

Its roots have been used as a strong laxative for about 5,000 years. Roots and stem are rich in anthraquinones such as emodin and rein. These substances are known for their diarrhea and excretory acceleration effects.

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