Help me identify the plant that gave me blisters.
Hi there, I lightly brushed up against this plant a few days ago, and in the spots where the spiny under leaf touched me, I developed blisters (if you zoom in, you'll see the prickly rib on the underside of the leaves). They're not itchy or painful at all (in fact, I didn't notice the scratches until the next day, when the blisters started to form where I had been scratched). Can't seem to find anyone who knows what this plant is. It was growing in a friend's side yard, which is very close to train tracks and was about 4 feet tall at the time. I have another photo, as well as photos of my blisters, if that helps. :) Thanks!