I googled 'daisy seedlings', and a couple of the first photos that came up with just a couple true leaves look very close.
So I googled 'daisy seeds', but none of the seed looked round as in my mystery seed. When I get a chance in a couple days, I'll have to take the jeweler's loupe and get a real close-up view of just how these seed look.
Thanks for the input. There are a =lot= of different daisies out there, so I'm keeping an open mind.