What kind of plant is this thing on?
hortster

It's on a bush that grows wild only in NE Calif. A type of ceanothus I believe, it's called deer brush.

I forgot to add that it's approx. 2" in dia. Now it's going to look like I got my answer & nobody else will come in here. Oh well, I'll just have to wait & hope I get lucky & see who or what emerges.

hortster asked about the plant because that can often be an essential piece of information when it comes to identifying something like this.

I'll suggest that it might be the cocoon of the Ceanothus Silkworm moth.

Here is a link that might be useful:

Dats da one, You probably won't see this, but thanks Rhizo

I see it, and you're welcome! And thanks to hortster for helping to narrow down the possibilities.

Me too agreed with hortster.