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'''Rheum rhabarbarum''' is a species of plant in the family Polygonaceae. It produces large poisonous leaves that are somewhat triangular, with long fleshy edible stalks and small flowers grouped in large compound leafy greenish-white to rose-red inflorescences.
==Uses==
{{Uses|Heartburn}}, {{Uses|Stomachache}}, {{Uses|Gastrointestinal disorder}}, {{Uses|Bleeding}}, {{Uses|Skin eruptions}}, {{Uses|Hemorrhoids}}, {{Uses|Anal fissures}}, {{Uses|Diarrhea}}, {{Uses|Sore throats}}
==Chemical Composition==
The chemical composition of rhubarb juice is characterised by a low relative density and low Brix (4–4.8 °Brix), due to a low sugar content (about 12 g/l), whereas the total acidity is high (about 17 g/l). The major acid is malic acid, followed by oxalic acid and citric acid. T<ref name="chemical composition"/>
==Common names==
{{Common names|kn=|ml=|sa=|ta=|te=|hi=|en=Rhubarb , rheumRheum}}
==Properties==
===Fruit===
{{Fruit||7–10 mm|clearly Clearly grooved lengthwise, Lowest hooked hairs aligned towards crown|With hooked hairs|manyMany}}
===Other features===
<gallery class="left" caption="" widths="140px" heights="140px">
'Rheum x hybridum' Rhubarb Victoria Capel Manor Gardens Enfield London England 1.jpg
'Rheum x hybridum' Rhubarb Victoria Capel Manor Gardens Enfield London England 2.jpg
1024 Rhabarber-Blütenstand 2903.jpg
98 - CIMG3839.jpg
Am Geméisgaart op der Pafemillen-104.jpg
April 22, Rhubarb.jpg
Blühender Rhabarber 1.jpg
</gallery>
<references>
<ref name="chemical composition">[https://www.sciencedirect.com/science/article/pii/S0023643812003131 "chemical Chemical constituents"]</ref>
<ref name="Leaf">[http://eol.org/pages/485576/details "Morphology"]</ref>
<ref name="How to plant/cultivate">[https://www.whiteflowerfarm.com/how-to-grow-rhubarb "Growing Rhubarb"]</ref>
</references>
