Scrophulariaceae (Magnoliophyta)
Penstemon ambiguus subsp. laevissimus D.D.Keck
J. Washington Acad. Sci. 29: 496. 1939
Specimen 1: Isotype -- I. W. Clokey 8113
Specimen 2: Isotype -- I. W. Clokey 8113
Specimen 3: Isotype -- I. W. Clokey 8113
Specimen 4: Isotype -- I. W. Clokey 8113
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