f3v

[-JKP-]

The passage in Pliny is You are not allowed to view links. Register or Login to view.. He does talk about white hellebore.
I agree that the root looks somewhat like a scorpion's tail, but the Scorpio in the zodiac/calendar section was apparently drawn by someone who had no idea what a scorpion looks like. This doesn't necessarily refute your idea, as the pictures could have originated in different sources, but it should be kept in mind.
On Pritzel: His book was posthumously edited, so it could be that some notes were mixed up. But the same name was often used for very different plants in different times and places.

Oocephalus, at first I thought the lizard-scorpions in a small number of zodiac cycles were drawn that way because the illustrators didn't know what a scorpion looked like (and they were from central Europe so it's quite possible they DIDN'T know what a scorpion looked like), but I discovered after some more research that there is a greenish lizard in central Europe called Scorpio. So, it's possible that the lizard and its name may have inspired the zodiac Scorpios that look like lizards or lizard-dragons rather than actual scorpions.