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I didn't think we were allowed to do that but it's fine by me. It's neat how the third ant appeared with the level and color adjustment. Anyhow it saves me the trouble of posting a follow up picture.

I felt this was worth being a NTA because there are two silhouettes of the ant in question. One appears to be a Crematogaster while the other is more Lasius like. Both are known to tend aphids which are the other bumps all over the plant. But the tuff of hair at the tip of the abdomen I believe is consistent with Lasius species and enough to give you an idea that's what both ants are.
I make it no secreat that I live in North America, and New Jersey of all places, though I didn't post that here.
Given it's a Lasius this leaves a few options. Lasius flavus group have orange workers and surely wouldn't cast such a silhouette with the lighter legs. Lasius claviger and umbratus also have orange workers and their silhouettes can also be ruled out. Not to mention they are both subterranean and not likely to be foraging for aphids above ground. So that leaves us with Lasius niger group which are above ground foragers and dark ants. The most common of these (I think) are L. neoniger and L. alienus. L. neoniger doesn't have lighter legs so that only leaves L alienus.

So, the correct ID, as I see it, is Lasius alienus. However, my method of identifying them didn't involve any use of keys so this is open to debate. I've had queens of them ID'd before when the colonies fly in my yard. I know them simply as the Lasius with yellow legs. Unfortunantly I can't really post any follow up pictures besides this blurry one. Warm weather has caused the ants to move on and there are no more aphids on the plant, a Cosmos. Thank you very much to those who participated. And a special thank you to Harpegnathos for getting it right and posting it. Also thank you Doctorant who I showed the picture to and consulted with before posting this.