familyPlantaginaceae
genusPenstemon
subgenusPenstemon subg. Penstemon
sectionPenstemon sect. Cristati
speciesPenstemon cobaea
Penstemon cobaea var. purpureus
Proc. Acad. Nat. Sci. Philadelphia 73: 490. 1922.
Endemic
Synonyms: Penstemon cobaea subsp. purpureus (Pennell) Pennell
Corollas violet to purple. 2n = 16.
Phenology: Flowering Apr–Jun.
Habitat: Limestone and dolomite glades, barrens, cliffs, calcareous prairies.
Elevation: 100–300 m.
Distribution
Ark., Mo., Okla.
Discussion
Variety purpureus is concentrated in the Ozark Plateau of north-central Arkansas and south-central Missouri. Populations of Penstemon cobaea on the Coastal Plain region of southwestern Arkansas and southeastern Oklahoma, which are 300–400 km disjunct from the core populations of var. purpureus, are included here.
Selected References
None.
Lower Taxa
None.