Scouring rush and field horsetail are two species in the Equisetum genus. These are primitive plants that produce spores rather than seeds, but they spread primarily by underground rhizomes. Until recently these two weeds were found primarily in roadside ditches, but the reduction in tillage has allowed them to spread into crop fields.
Iowa State University
Hartzler, Robert G., "Equisetum: From the Ditch to the Field" (2015). Integrated Crop Management News. 333.
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