Four flowers I should know the names of but don't

Hi. Attached are four snapshots of flowers I am using in a digital art project. I believe the first is a Gazenia but want to be sure, and don't know the others. Would appreciate any guidance.

Thanks,
David

 

The last two look like dahlia to me.

 

Thank you. Anybody have any idea what the second flower is?

More anon,
David

 

Perhaps a Gaillardia

 

Gaillardia, or something else?

Thanks. After your reply, I did some looking on the web for Gaillardia. These flowers don't look like any I've seen on the web -- the one I'm curious about has a bulging center with the petals almost swept back, somewhat like an echinacea flower. I encountered more of these flowers yesterday, but could find nobody around to ask what they were. Too bad.
- David

 

another plant that comes to mind is Rudbeckia

 

Black-eyed Susan

Thanks. Just did a search on Rudbeckia, and indeed I think there is a match. Black-eyed Susan, I found, is it's colloquial name. They did look dimly familiar from childhood. So far I haven't been able to find an exact match, but the general shape and size of these flowers and Rudbeckia sound right. The orange central ring of the petals is different from what I take to be the more typical black-eyed Susan.

More anon,
David