External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:187148-2
- Publication
- Bulletin of the Torrey Botanical Club. New York
- Collation
- 33: 151
- Family as entered in IPNI
- Scrophulariaceae
Links
- Nomenclatural link
- Penstemon caudatus A.Heller, Minnesota Bot. Stud. 2: 34 (1898).
- Same citation as
- Penstemon angustifolius var. caudatus (A.Heller) Rydb.