Oxypolis rigidior, known as cowbane, common water dropwort, stiff cowbane, pig-potato, and Cherokee swamp potato, is a species of flowering plant in the carrot family native to eastern North America. It is a perennial wildflower found in wet habitats. Oxypolis rigidior has been reported as being poisonous to some mammals, but it is also considered edible and safe by some authors.

...