Or, find an older pilots survival scarf-the ones with a map on one side, & survival infor on the other.
Blackeagle, that was the only name of a cactus that I know

. Well, I know prickly pears, but I know you can eat those. Didnt know about the saguaro though. And, I had no idea poison ivy could be found there. I was under the assumption it was an east coast plant. I learned something new!