tel jetson wrote:any chance you've got access to some palatable air potatoes (Dioscoria bulbifera)? I'm on the other side of the continent where they aren't invasive. if you could get some air potato, I bet I could track down some of what you're looking for.
Sorry to burst your bubble, but I came across this when looking up air potatoes on wikipedia:
Uncultivated forms, such as those found growing wild in Florida can be poisonous. These varieties contain the steroid, diosgenin, which is a principal material used in the manufacture of a number of synthetic steroidal hormones, such as those used in hormonal contraception.[2] There have been claims[3] that even the wild forms are rendered edible after drying and boiling, leading to confusion over actual toxicity.
Sounds iffy, at least.