Hey shear,
Here's one that you DON'T want to harvest for seeds. The Showy Rattlebox. I'm not sure if they're growing in your zone right now. Here they're everywhere. They're beautiful when in bloom, but are highly toxic, especially the seeds. They were introduced to the U.S as a cover crop, or green manure crop, for sandy soil. They're a legume, so they add nitrogen to the soil. They're considered invasive now. Ironic, isn't it?
Anyway, particularly if you have pets or young children, you may want to remove them from your yard to prevent ingestion or transference of toxins. I'm sorry. I'm not trying to hijack your thread. I just thought you should know.
Do you have Oleander growing? Mine usually seed in winter, (in south Florida).

Here is a link that might be useful: {{gwi:137388}}

Hi, Jamangel. I've never seen a plant that looks like that around here? That's not to say it doesn't grow here, I've just never seen it.

I don't have Oleander... yet. It's on my list of plants to get, though. Maybe I should go for a "walk" in my neighborhood! LOL! But seriously. What do the seeds look like?

There's ripe oleander pods all over FL now. The seed pods are long and cylindrical with tapered ends. When ripe they'll split allowing 100's of small brown seeds with a fluffy beige tuft to escape.

Here is a link that might be useful: oleander seed pods

Ok, thanks Karyn1. I'll go seed-hunting!

Ok, thanks Karyn1. I'll go seed-hunting!