External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:187537-2
- Publication
- Manual of the Flowering Plants of California
- Collation
- 917
- Family as entered in IPNI
- Scrophulariaceae
Links
- Nomenclatural link
- Penstemon azureus Benth.
- Same citation as
- Penstemon heterophyllus var. azureus Jeps.