Penstemon heterophyllus S.Watson
, Botany [Fortieth Parallel] 222 (1871).
External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:808135-1
- Publication
- United States Geological Exploration [sic] of the Fortieth Parallel. Botany. Washington, DC
- Collation
- 222
- Date of Publication
- Sep-Dec 1871
- Family as entered in IPNI
- Scrophulariaceae