I agree that it's a coreopsis, probably a garden escapee.

As a retired teacher, I have to echo purpleinopp's post as far as knowing how to use different resources (and people are a resource) and finding info. An additional skill that is much needed is knowing how to discern whether or not the info is true, and remembering that just because you read or hear something, it isn't necessarily true. If the OP is an advanced biology student worried about his/her grade, the first thing that student will most likely do after getting info from this site is to confirm it. And therein lies a lot of learning. If there is a true desire to help learning and not just spoon feed info, it would be useful to provide one reason for each suggestion...that would give the OP a place to start with a confirmation. #5...I'm sure I'm off base since it hasn't been suggested, but the first thing I thought of looking at #5 was an oenothera...based on the shape of what I think is a flower bud or seed pod, and, again what I think I see, the stigma. As others have said, it is difficult to discern details when the flowers have been dried and pressed, and in these photos, even colors.

Maybe Scutellaria ovata. Right on with the scullcap guess.

Hi Megan, if you haven't done so already, try posting this in the Name That Plant! forum. It gets a lot more traffic, and they really know their stuff there.