Well, he's trying to recognize the plants and work out backwards from their known names, but there's a lot of assumptions and glossing over involved in this approach. 1) A figure hints at a sunflower, but the idea is refuted based on the supposed location and date of this manuscript (sunflower is native from the American continent). 2) Another figure was recognized as "coriander", that looks nothing like it, but they…
[1] http://www.edithsherwood.com/voynich_botanical_plants/plant....