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[Linda]

The plant is a type of Silene with over 700 varieties it is very difficult to pinpoint exactly which one. The plant roots were used 
" A Xhosa diviner identifies and collects the plant from the wild. The roots are ground, mixed with water, and beaten to a froth, which is consumed by novice diviners during the full moon to influence their dreams. They also take it to prepare for various rituals. The root has such a strong, musky essence that the diviners who consume it exude the scent in their sweat" You are not allowed to view links. Register or Login to view. In the Voynich it talks of them not only cooking the leaves in winter and saving seed, but also of eating the 'sweet potato' after cooking.
I know everyone is hung up on the leaf illustrations in the Voynich, but there were trying to draw the small leaf protrusions sticking out at the base of the leaf and stem. This image of a california variety shows it best. You are not allowed to view links. Register or Login to view.

I had thought so too,  and as the leaves were used in some cases i thought they resembled the leaves after they were removed, re Silene vulgaris anyway. I think one with tuberous divining roots is from africa.