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..2 Inflorescences 1-flowered; perianth yellow, radially symmetrical; [widespread in our region]
..2 Inflorescences 2-10-flowered (opening each day); perianth mauve, bilaterally symmetrical; s. TX near the coast, westwards and southwards]
......4 Base of petiolate leaf blades cuneate to truncate; leaf apex acute to obtuse; perianth radially symmetrical or nearly so; vegetative stems elongating only in water deeper than 5 cm; perianth tube 15-45 mm long
......4 Base of petiolate leaf blades truncate to cordate; leaf apex obtuse to rounded; perianth bilaterally symmetrical; vegetative stems commonly elongating; perianth tube 11-29 mm long
........5 Inflorescences 5-16-flowered, the axis elongating well beyond the spathe tip, thus many of the flowers borne well beyond the spathe; perianth lobes lavender to purple; [s. IL, s. IA, se. NE south to MS, LA, and s. TX; rarely adventive eastwards, as in n. AL and c. NC]
..........6 Second node above the base of the inflorescence < 5 mm long; hairs on the lateral filaments purple; leaves rounded-oval; [Coastal Plain, s. NJ south to ne. NC]
..........6 Second node above the base of the inflorescence > 5 mm long; hairs on the lateral filaments white; leaves reniform; [widespread in our region]