Furcraea foetida var. mediopicta seems to be the correct name.
http://apps.rhs.org.uk/horticu...
Only Furcraea foetida is listed in the Plant List which I'm sure you have checked..
http://www.theplantlist.org/tp...
So what do we do about the three in the database?
http://garden.org/plants/searc...
The RHS only has two listed, the other Furcraea foetida
http://apps.rhs.org.uk/rhsplan...
ITIS only lists Furcraea foetida ..
http://www.itis.gov/servlet/Si...
It appears Furcraea foetida 'Mediopicta' has been adapted from the var. for selling purposes.
I found a site using the correct name!
http://www.colourwise.com/Plan...
Another without the 'var.' but at least they used lower case for mediopicta ..
http://plantlust.com/plants/fu...
This site refers to it as a cultivar, not so?
http://www.prota4u.org/protav8...
This site call it both a cultivar and a variety ..
http://www.succulent-plant.com...
Furcraea foetida 'Variegata' is probably the same as var. mediopicta?
http://www.onlineplantguide.co...
The American Public Gardens Association are the holders of Furcraea (Taxonomic group)
http://www.ishs.org/sci/icrali...
I can't find anything on their site, maybe you could contact them?
http://www.publicgardens.org/c...
