Penstemon ambiguus var. laevissimus (D.D.Keck) N.H.Holmgren
, Brittonia 31: 104 (1979).
External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:187140-2
- Species Name
- Penstemon ambiguus Torr., Ann. Lyceum Nat. Hist. New York 2(7): 228. (1827).
- Publication
- Brittonia; a Series of Botanical Papers. New York, NY
- Collation
- 31: 104
- Family as entered in IPNI
- Scrophulariaceae