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.

The leaf shape of some of the more common rumex weeds is shown in the second image. The docks are closely related to sheep's sorrel, which is also grouped in the rumex genus. Another common dock found ...