Amorphophallus salmoneus

The following info has been extracted from Aroideana, Volume 19, a publication of the International Aroid Society.  You'll note that this is just a small portion of the extensive descriptive information available in the Aroideana 19:

Tuber 5-15 cm in diam, 3-9 cm high
Leaf petiole entirely green or with a few scattered, small white dots,
5-70 cm long, 2.5 cm in diam (base)
Leaf lamina to 110 cm in diam, leaflets elliptic-lanceolate
Spathe 9-20 cm long, 6-10 cm in diam
outside pale whitich green or pale magenta
inside pale green, the base dirty reddish brown
Spadix 9.5 - 20 cm long, equaling the spathe

(extracted with permission from Aroideana volume 19)