Dirt,
Those are the 2 best sites to use. If you haven't figured it out from them, I suggest posting here, on the Name That Plant Forum, and/or the Winter Sowing forum.
Remy

I use the one!

Here is a link that might be useful: seeds id

After some head scratching and site browsing, I haven't really been able to figure out what exactly I have from those sites, so I've attached some pictures of them below. Thank you for any help you can provide!

It's definitely a mallow of some kind, perhaps a zebrina or French hollyhock (search for Malva sylvestris) or a lavatera (not sure there is a common name). Did you grow either of those or recall seeing them where you collected the seed? Definitely a mallow.

I second the mallow. I harvested lots of seeds from mine that look like the photo above as well as the pods having that lacy look to them. I didn't plant the one that grows here--it's been here since I moved in 5 years ago. I decided it was a perennial rather than a weed when it came up in the same spot year after year.

Thanks both of you. I collected it from a bushy plant in an empty lot in a residential area. It would make sense that it's a hollyhock as they seem to be popular in that neighbourhood if I remember correctly. Into the metaphorical ground they go! We'll see what comes up.

I also agree that they are the mallow family. There are more than 3,000 plants in the family - with most seeds and pod looking similar.

Here is one of the best online sites and this link will take you to the Alcea page - the family of Mallows. Seed identification using the seeds only can be daunting, nerdy but really interesting and each one is beautiful. There are a lot of photographs to look through but this is one of the best sites I have ever found. Have fun!

http://theseedsite.co.uk/allpodsfam6.html

Here is the link to the photos of the seeds. http://theseedsite.co.uk/seedsize15.html  There does not seem to be a good way to enlarge the photos except for increasing the size of the page.

Here is a link to a downloadable plates of wonderful drawings of hundreds of seeds. The drawings were done around 1934 and of course are just as valid as if they were done today. http://accessiblegardens.org/