My question: what kinds of leaves, or other plant parts, would a North American who grew up in a suburb, and who has not made any special study of botany, be most likely to recognize? And which ones would such a person know the names of offhand? The only two I can think of off the top of my head are maple, cannabis and acorns. Are there any others you all can think of?
Edit: some people have for a little more information, so let me see... Some of my characters grew up in a town on the coast of California between L.A. and San Francisco, some are from the southern part of the US, some are from the mid-west US and one has been to Canada, Mexico... just about anywhere in North America, the UK and Europe, but she's not particularly interested in plants. The situation is they are looking at a series of drawings of fall scenes and they are trying to figure out what the various kinds of leaves, trees and other plants in them are.
Edit: Thank you all so much. I think I've got enough to start with now.