Eupatorium mohrii, commonly called Mohr's thoroughwort, is a herbaceous perennial plant in the family Asteraceae native to the southeastern and south-central states of the United States, in the coastal plain from Virginia to Texas.

[3] It has also been found in the Dominican Republic.

[4] Eupatorium mohrii is a perennial herb up to 100 cm (40 inches) tall and are producing tuberous rhizomes.

As with other species of Eupatorium, the inflorescences contain a large number of tiny white flower heads, each with 5 disc florets but no ray florets.

[3] Eupatorium mohrii grows in moist areas, edges of ponds, and sandy soils.