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1 Flowers pale to medium blue (rarely white); basal leaves fewer, smaller, rarely over 10 cm across, on shorter and wirier petioles; root thickened, tuberous; [subgenus Aconitum; section Napellus].
..2 Upper leaves mostly 7-lobed; helmet about as high as long, rounded or slightly prolonged above the beak; [NY, OH, WI, and IA]