Anyone with Greek knowledge here?

I hate resorting to this, and I hope this isn't breaking the rules (it's not actual homework, it is for an online article that has been challenged, anyone responding will get credit if in whatever I do in what ever form they wish) but I'm lost on the Greek, it's certainly not my language, so I was wondering if someone here could help me with a translation of ὑαλος? It's being given in some translations of a text as "isatin appellant" or "isatis" but I need to be absolutely sure that this does refer to the plant by that name and I'm finding no other indication, other than the one text, that it does.

Thank you...even if you prove me wrong.