⚠ Version 1 of The Plant List has been superseded.

This name record (from WCSP (in review)) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Castilleja arachnoidea in version 1.1 of The Plant List.

Castilleja arachnoidea subsp. shartensis (Eastw.) Pennell is a synonym of Castilleja arachnoidea Greenm.

This name is a synonym of Castilleja arachnoidea Greenm..

The record derives from WCSP (in review) which reports it as a synonym with original publication details: Proc. Acad. Nat. Sci. Philadelphia 99: 177 1947.