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Arisaema flavum 'Giant Double' 
Double-flowered variant of the 'giant' form. Two inflorescences on a single plant showed the doubling characteristic. Growing in Massachusetts, July, 1998.

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Arisaema flavum
Arisaema flavum
Scale in inches, measured from ground level.
Two inflorescences from the same plant/tuber. Scale in inches, measured from ground.
Stems have grown several inches since the first ruler picture was taken.