Amorphophallus atroviridis

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 15 cm long, 5 cm wide
Leaf petiole 10-50 cm long, dark reddish brown with some rounded, dirty white, brown-centered spots and numerous, tiny, dirty white dots
Leaf lamina 18-60 cm in diameter, densely velvety hairy,
Spathe 10-13 cm long, 8-9 cm in diameter
Spadix 25-31 cm long, entire margin pinkish violet; about twice as long as spathe
Dormancy keep totally dry

(extracted with permission from Aroideana volume 19)