Minnesota’s livestock producers face an ongoing challenge from toxic plants that can cause severe illness or death in cattle, sheep, and horses. Among the most hazardous are bracken fern, chokecherry, ...

one Ellis Haiden, tough-palated, raked cockleburs off his mittens with his teeth. One cocklebur, three-fourths of an inch long, skidded along his tongue, down his throat; lodged in his right lung.

Cocklebur and downy thorn-apple are mostly confined to sandy substrates in riverbeds and often occur together, while parthenium invades more compact soils of the riparian areas. A study by a ...