Frank Mayfield   cc-by-sa-2.0

Oxypolis rigidior (Stiff Cowbane) is a species of perennial herb in the family Apiaceae. 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 Pyrota germari, Chelynia, Myrmosa, and Meromyza americana. Individuals can grow to 1.5 m.

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EOL has data for 18 attributes, including:

Known occurrences, collected specimens and observations of stiff cowbane. View this species on GBIF