Penstemon arkansanus Pennell. Arkansas Beardtongue. Phen: Apr-Jun. Hab: Glades, woodlands. Dist: S. IL, s. MO, and n. OK south to s. AR and s. OK.

Origin/Endemic status: Endemic

Synonymy: = Ar, F, FNA17, Il, K3, K4; = Penstemon pallidus Small ssp. arkansanus (Pennell) R.W.Benn. – Bennett (1963); > Penstemon multicaulis Pennell; < Penstemon pallidus Small – C

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
• Great Plains: FACU (taxonomic split from wetland indicator species)
• Midwest: UPL (taxonomic split from wetland indicator species)
• Northcentral & Northeast: UPL (taxonomic split from wetland indicator species)

Heliophily: 8