With the recent movement towards providing mortals with foods that have effects that cannot be gleaned from identify and the like, the horticulturist (if there's a better name use it) would be a fun addition.

He's basically a plant and fungus expert who will tell you what effects a certain plant species is known to have. The more unique the species (is it limited?) or the more powerful the effects of the plant, herb, or 'shroom the higher the price to be paid.

He may not tell you everything and he may not tell you anything, much like the browse command.