⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-50322626, with some changes.

Peucedanum rigidum var. ambiguum (Nutt.) Alph. Wood is a synonym of Oxypolis rigidior var. ambigua (Nutt.) B.L. Rob.

This name is a synonym of Oxypolis rigidior var. ambigua (Nutt.) B.L. Rob..

The record derives from Tropicos which reports it as a synonym (record 50322626) with original publication details: Amer. Bot. Fl. 136 136 1870.