Sorrel (Rumex acetosa), also called common sorrel or garden sorrel, is a perennial herbaceous plant in the family Polygonaceae. Other names for sorrel include spinach dock and narrow-leaved dock ...

Sheep's sorrel currently has a botanical name of Rumex acetosella though at times it has been known as Acetosa acetosella. It has a creeping root system, which is very similar to a rhizome system.