I'm guessing this is a weed? Or is it a flower of some kind?

I think this is a variety of Mallow. In some areas this grows as a wildflower.

From your photo it looks like a type of begonia. IF not that it looks right pretty.

I don't think it is a weed. Does it have gray scale like hairs on the leaves? It may be Sphaeralcea coccinea which is a native plant for NV. Not completely sure.

Take a sample to the local extension office. Also have pictures of the whole bush and close up of a leaf and a flower.

Definition of a "weed" : something you don't want growing in your yard or garden.. Yes, some plants that are called weeds are actually kind of pretty and are very hardy. But if they are growing where you don't want them to, then either curtail them or get rid of them.

Does not look like a weed. I think it is flowering maple. Google the image and see what you think.

If you like it it's a treasured flower, if you don't a weed! I think it's beautiful.

It looks like an Ivy ground cover. If you want to kill it without chemicals, pour vinegar on the patches. Only on what you want to kill as it also kills grass and plants.

A weed is any flower you don't like.

could be, cause once the seeds spread it invades everything pull them or dig them up after it rains ,easier on your back I pull up anything that i haven't planted

I f you pull it out and it comes back yep it was a weed,