Rhubarb
Rhubarb is one of about 60 plants in the genus Rheum, family Polygonaceae. The vegetable rhubarb is Rheum rhabarbarum (or Rheum x hybridum). The leaves are somewhat toxic because they have oxalic acid, but the red stalks are baked in pies, with sugar to soften their tart flavor.
| Rhubarb | |
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Scientific classification 
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| Unrecognized taxon (fix): | Plantae |
| Order: | Caryophyllales |
| Family: | Polygonaceae |
| Genus: | Rheum |
| Species: | R. rhabarbarum
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| Binomial name | |
| Rheum rhabarbarum | |
There are many varieties grown for eating. The drug rheum is prepared from the rhizomes and roots of another species, R. officinale or medicinal rhubarb.