Rheum officinale, medicinal rhubarb: taxonomy, morphology, habitat, cultivation, phenology, phytochemistry, history and conservation in one complete profile.

Sheep-sorrel (Rumex acetosella): taxonomy, morphology, acid-soil habitat, cultivation, phytochemistry, history and conservation of a global colonist.

Rheum rhabarbarum, garden rhubarb: taxonomy, morphology, habitat, cultivation, phytochemistry and history of a perennial with fleshy stalks and toxic leaves.

Rheum tanguticum, the Tangut rhubarb: taxonomy, morphology, alpine habitat, cultivation, phytochemistry, history and conservation of a Chinese endemic herb.

Chinese-rhubarb (Rheum palmatum): taxonomy, morphology, habitat, cultivation, phytochemistry and history of a giant herb from the mountains of China.