Looking at compound leafs in link may help eliminate some variety or nut shape size and smooth are rough.
I'm not expert on walnuts.

Here is a link that might be useful: ID walnuts

there are tree peeps.. in the tree forum that can ID any tree .. with a pic of a leaf.. trunk.. and the hole .. and in your case a nut wouldnt hurt ...

i dont know if the fruit peeps know their nuts .. but it wouldnt surprise me

there is a joke in there.. and i will let you amuse yourselves ...

ken

Thanks Gator. I can't tell what scale they're using, but it's definitely not black walnut, the shells on these are smooth.

And there's no way the California walnut is growing around here.

Anyone have any idea how to read the chart? It makes it look like the J. major is well over an inch in diameter (4cm?), and I don't think any I've hulled are that big.

Eastern Texas has a lot wild Hickory Trees there nuts shell smooth to bumpy.
In centimeter there 10 milometers in inch close to 25 milometers or 2.5 centimeter per inch.
What color shell?
Photo nuts, bark trunk, nut cluster and compound leaflet help ID.

Shell once cleaned is light tan.

Here are pictures I took a month ago... I'll try to get some better ones next week, before we move off campus. This one's less than 50 yards from my desk, but it'll be across town here in a few weeks.

http://imgur.com/a/6GjoB

Here is a link that might be useful: Photo album of walnut tree

Is the husk or hull of the nut hard and segmented with lines resembling the seams on a football that separate to expose the nut, or is the husk more one solid piece and more corky in nature that crumbles away from the nut.

The husk isn't coming off on its own. Dries and wrinkles up, stays on. Corky, crumbles away when scraped or scrubbed.

The shell smooth Tan color compound leaves pointed and count tree bark my guess be J. hindsii. Walnut

Nuts are too big for hindsii. Out of 5 I've hulled, most are slightly larger than 1/2" in diameter, one quite smaller, another is almost 3/4". Not only that, but I'm in northwest Texas. Way far outside of its range.

I think it can be ruled out. And since I can rule out J. nigra, that leaves microcarpa and major. I'd be happy with either. Guess it could be a hybrid of those two, considering I'm sort of where their ranges overlap.

I have new pictures if anyone can help me identify these.

Here is a link that might be useful: New pictures with ruler for scale

All I'd add is that nut size is probably very small this year. The tree pictured is drought stressed as evidenced by sparse foliage. This is very common in west Texas this year. Some pecans down here are the size of hickory nuts.

So size alone isn't helpful for identification.

Any idea if they'll germinate though? Was going to put them in the fridge for 3-4 months and try...

They should germinate if there is a decent nut meat in there.

I grew the black walnut from seed in Amarillo. The tree grew very well but I moved before it set nuts.