⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record gcc-66619, with some changes.

Haplopappus carthamoides var. rigidus (Rydb.) M.Peck is a synonym of Pyrrocoma carthamoides var. carthamoides Hook.

This name is a synonym of Pyrrocoma carthamoides var. carthamoides Hook..

The record derives from TICA which reports it as a synonym (record 3E63BB0C-E759-4EF7-A247-D02EE88B360A) with original publication details: "Man. Pl. Oregon 712. 1941 as Aplopappus; Madrono, 6: 136. 1941 [as Aplopappus]" 712 1941.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:117470-2.