Ruellia nudiflora (Engelmann & A. Gray) Urban var. runyonii (Tharp & F.A. Barkley) B.L. Robinson. Runyon's Wild-petunia. Phen: Feb-Jul. Hab: Gravelly, calcareous soils of open areas and woodlands. Dist: S. TX south into Mexico.

Origin/Endemic status: Native

Synonymy: = K3, Turner (1991); = Ruellia runyonii Tharp & F.A.Barkley – Mex; < Ruellia ciliatiflora Hook. – K4, Daniel (2013); > Ruellia runyonii Tharp & F.A.Barkley var. berlandieri Tharp & F.A.Barkley – Tx; > Ruellia runyonii Tharp & F.A.Barkley – Tx

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