I searched for the subspecies of Xanthosoma brancoanum which (Xanthosoma riedelianum var. brancoanum) is listed as a synonym of Xanthosoma riedelianum on the Plant List Myriam.
http://www.theplantlist.org/tp...
I found a specimen of that which is on Kew, you can't enlarge it but it doesn't look correct.
http://plants.jstor.org/specim...
There's drawings of leaf shapes of Xanthosoma species on plantillustrations, you can see how difficult it is..
http://plantillustrations.org/...
