⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-29206026, with some changes.

Orthocarpus sonomensis Eastw. is a synonym of Castilleja ambigua Hook. & Arn.

This name is a synonym of Castilleja ambigua Hook. & Arn..

The record derives from Tropicos which reports it as a synonym (record 29206026) with original publication details: Leafl. W. Bot. 2(6): 104 104 1938.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:176783-2.