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Rhubarb leaves contain poisonous substances, including oxalic acid, a nephrotoxin. [43] The long term consumption of oxalic acid leads to kidney stone formation in humans. Humans have been poisoned after ingesting the leaves, a particular problem during World War I when the leaves were mistakenly recommended as a food source in Britain.
Rhubarb isn’t the only vegetable with toxic leaves. In fact, the potatoes we see at the grocery store are edible, but every other part of the plant is toxic. So if your spuds start growing lots ...
The leaves and stems of all species of the genus Chenopodium and related genera of the family Amaranthaceae, which includes quinoa, contain high levels of oxalic acid. [37] Rhubarb leaves contain about 0.5% oxalic acid, and jack-in-the-pulpit (Arisaema triphyllum) contains calcium oxalate crystals.
Though the root of the Chinese rhubarb is a key facet of herbal medicine, its leaves can actually be poisonous if consumed in large amounts due to the oxalic acid content. [6] Patients with "arthritis, kidney problems, inflammatory bowel disease, or intestinal obstruction" should refrain from consumption.
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The poison is a complex mix of lectins with the highest concentration in the fruits and seeds, followed by the root bark and the flowers. There is little poison in the leaves. [179] The lectins, generally called robin, are less toxic than those of e.g. Abrus (abrin) or Ricinus (ricin), and in non-fatal cases the toxic effects tend to be ...
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The genus includes the vegetable [3] rhubarb. The species have large somewhat triangular shaped leaves with long, fleshy petioles. The flowers are small, greenish-white to rose-red, and grouped in large compound leafy inflorescences. Many rhubarb cultivars have been domesticated as medicinal plants and for human consumption.