http://apps.kew.org/wcsp/namedetail.do?name_id=8282

Google is your friend.

http://en.wikipedia.org/wiki/Konjac

Thanks folks!

And, Tommy, I always treat Wiki with a healthy dose of skepticism -- I have found misinformation there many a time.

Wiki has a lot of good information, if you can be sure you can recognise and separate it from the bad. If you put up a study paper based on references from Wiki it would be rejected outright. It's not regarded as an acceptable reference. The Kew database is the ultimate accepted authority for plants. It's updated daily (which also means what's accepted today may be obsolete tomorrow).

I agree Wiki isn't a totally reliable source. I go to various other sites when I google to get a general consensus.

International Aroid Society lists A. konjac as the valid species. A. rivieri is not listed as species or synonym

Here is a link that might be useful: Aroid.org

The International Aroid Society is the central point for registration of hybrids and cultivars. But the data they provide on species is incomplete. You only have to look in their genera lists to see that there are large numbers of species missing. They rarely put in synonyms.

Amorphophallus rivierei Durand ex Carrière, Rev. Hort. 42: 573 (1870) is the full reference of the synonym.