Does it smell like Chrysanthemums? My first thought was Tanacetum parthenium. Feverfew, but the leaves look slightly odd. However, I see that the foliage of the surrounding plants also looks damaged in various ways, so I think I'd stick to Feverfew.

How about Anthemis?

Which one were you thinking of NHBabs? I don't know any Anthemis with multiple flower-heads on a single stiff tall stem.

I am wrong I think floral.

Thanks so much everybody - the decoguy, foral_uk, & NHBabs! I think it's probably Tanacetum parthenium feverfew (I never knew the Latin name before). We have a local herb sale 2x/yr - most probably it came from that sale - so feverfew makes a lot of sense. Will smell next time I'm at the community garden to be sure. Also the leaf compares well w/ an entry on wiki listed below. An extremely wet, hot summer has resulted in lots of damaged foliage, but good tough plants just keep truckin' on. Thanks again! Link: Feverfew at wiki (scroll down).

Don't need wiki, ;-) this stuff self sows all over my allotment.

The leaves don't resemble my feverfew much, so that is why I was trying to come up with something else. Even the flowers are a bit different, but I know that it has different cultivars, so the difference might be due to it being a different cultivar.

The leaves are slightly odd but they look deformed to me, not naturally shaped like that. I wonder about spray drift since the three plants in the background look a mess too.