Hey there, Beans!
#1) Looks like an
A. Ghiesbreghtii variant. The leaves aren't wide enough, though! So I would think that it is a variant
something in this highly variable complex! (This includes
A. lophantha,
A. triangularis, and
A. horrida ssp.
perotensis, among others). After reading Gentry closely, I thought Greg's guess might be right; this one's teeth most closely align with
A. horrida ssp.
perotensis (notice the teeth in the photo in our Godfather's book under A. obscura). However,
my A. horrida ssp.
perotensis are consistently grey and not green! And no center stripe!! So maybe we are back to ... ?!
The other two are easier:
#2)
A. xylonacantha
#3)
A. avellanidens