Oxypolis rigidior (Stiff Cowbane) is a species of perennial herb in the family umbellifers. They have a self-supporting growth form. They are native to Eastern North America, North America, The Contiguous United States, and Canada. They have simple, broad leaves. Flowers are visited by Microplitis gortynae, Evagetes ingenuus, Agathis areolata, and Perilampus hyalinus. Individuals can grow to 1.5 m.
EOL has data for 22 attributes, including: