I enjoyed this thread on alocasias, I've grown them for decades. Here is an old pic of A. plumbea, a lighter form than Nigra which Gina posted. I call it 'Light Form', a collector says also called 'White Form', maybe Gina or someone else can help with the name. For me they both get about the same size, 4 to 5 feet tall. This has petioles with light brown flecks and spots on light green background, Nigra has a reddish or dark purple petiole. Very prolific with offsets.
Russ
Sanford/Lake Mary area, Fla