Colocasia


Dear Aroiders,

    Anybody out there has some kind of solid knowledge with Colocasia 
esculenta varieties, cultivars, etc? Sometime ago Peter told us that there 
was three varieties: C. esculenta var. esculenta (small, slustering tubers), 
C. esculenta var. antiquorum (large, solitary tuber) and C. esculenta var. 
aquatilis (long stolons). Are those varieties published anywhere? (i.e. with 
authors, etc) What happened with variety illustris? What about that form 
with an yellow blot in the middle of the leaves? The only complete treatment 
I have (my Precambrian 'Das Pflanzenreich') cites lots of varieties and I 
wonder most of them became synonims. Other interesting thing is that Engler 
never use tuber characters (except for the description of the variety 
aquatilis) so this is a new approach. Who did start to use tuber information 
on the classification?  Engler's classification uses the proportional lenght 
of the sterile appendix. Is this still important or was it proven to be 
highly variable (like almost anything in aroids)?  I am sorry if these 
questions were already answered before, but I couldn't find any satisfatory 
answer in the aroid-l archives.

                           Very best wishes,

                                    Eduardo.


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