Oxypolis rigidior (Stiff Cowbane) is a species of perennial herb in the family umbellifers. They are native to Eastern North America, North America, The Contiguous United States, and Canada. Flowers are visited by Microplitis gortynae, Evagetes ingenuus, Agathis areolata, and Perilampus hyalinus. Individuals can grow to 15 dm.
EOL has data for 15 attributes, including: