The link shows what they look like. The seeds are connected in a ring shape. You may have to rub the seeds between your fingers to separate them.

Here is a link that might be useful: Seed Pictures

When the flower dies off, there will be a seed pod that forms where the flower was. Dont pick it off until it turns brown. The seeds will be in a ring around the center of the--I believe its called--calyx.

I grew this plant from seed and it is very weedy. Pulled them all out. The original plant was very nice.

The seed pod is like a miniature hollyhock pod...

Can someone tell me if this is a Malva Zebrina coming up? I threw a bunch of old seed in this one spot and this is the only thing coming up! I had tons of the Malva Zebrina seeds, could this possibly be them? I might have thrown some other old seed in there too... I just couldn't remember what all I threw in there! :)
Rita

I'd give that sprout some more time and water. It does have a nasturtium look about it, but it's not unlike the Malva sprouts.

Martha

It is definitely nasturtium

SSE carries the seeds, photo at the link below:
Zebrina mallow

It is an outstanding bee plant, blooming early & continuously all summer. It will even survive a couple frosts, and may be the only pollen source at that point. It will self sow if allowed to; I've naturalized it in my vegetable gardens, and let the volunteers grow wherever they are out of the way.

I always let some grow along the fence line, because they are a really good trap crop for Japanese beetles. Of the few beetles that avoid the traps, about 1/2 will land on the Zebrina, rather than the beans... they are easily killed there.