There's a little bit of white around the beard that you can kind of see in the pictures, but other than that they're all yellow.

Here's one of the flower stems:

Any ideas?

I don't know its name, but it looks like a historic;
you might check Historic Iris Preservation Society (HIPS) photo gallery.

It sure has a rich, luscious, brilliant color!

Look at Harvest of Memories for a starter

I don't know the name either. Do you think it is a tall bearded iris or an intermediate iris? The flowers look small, but that might be because they are a bit crowded in the pot.
They are a beautiful color.

Here's a picture of the beard/fall.

Hosenemesis, I'm not sure what size/category they are. Are there particular measurements I can take to tell?

Flowers are definitely smaller than the Batik thats in another pot, but they are more crowded than the Batiks are.

They came in a 3g nursery pot, and they're now in a 14" pot... I just picked up the rootball and dropped it in new soil though, didn't want to break them up and not have them flower this year. There's some space around them in the pot, but the cluster is pretty dense in the middle (and there's violets growing in the dense part).

Aquawise, Harvest of Memories looks pretty close.
http://beautifulflowerpictures.com/Irises/harvest_of_memories_yellow_iris.html

Googleing found this: "Blooms in midseason and again in late summer to fall on 36-38" stems. "

They're definitely not that tall... maybe 18-24"? Could crowding cause that, or does that make them a different type?

They are a beautifu color.
kay

Harvest of Memories definitely has taller foliage than Batik, & tall flower stalks as you say. I would think it would be very possible to be caused by being potted & crowded. Harvest of Memories is a very vigorous plant.
My Harvest
{{gwi:682759}}

Acapuloc gold and Arcadia Buttercup are two to have a look at. Both have the little white spot at the end of the beard.