You were confused on how quickly Andy identified the flower from just glancing at the pamphlet.  His friend quickly explained it.

"He was left in the hands of Poison Ivy for for a while. Stuck in her garden, helping her out....... His brother wanted him to help her, Ivy wanted to use them both for her plans.. "

"All I gained from it besides that  was a reminder to wear something over my face, and a few botanical nightmares. ."