External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:1113825-2
- Species Name
- Penstemon crandallii A.Nelson, Bull. Torrey Bot. Club 26(7): 354 (1899).
- Publication
- Phytologia; Designed to Expedite Botanical Publication. New York
- Collation
- 72: 89
- Family as entered in IPNI
- Scrophulariaceae