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..2 Stem scabrous on the angles; corolla blue-purple; leaves ovate to deltate, narrowed to a broadly cuneate to truncate base and well-developed petiole (4-6 cm long on larger leaves)
..2 Stem glabrous or pubescent; corolla white; leaves lanceolate, narrowed to a cuneate, subpetiolar base
....3 Involucral bracts < 1 mm wide; peduncles usually < 1 cm long; [alien, so far known only from FL]; [section Marrubiastrae]
......4 Stem internodes short-pubescent; leaves 3-8× as long as wide; [NC to FL to e. TX]
......4 Stem internodes glabrous or nearly so; leaves 8-20× as long as wide; [c. and s. peninsular FL]