It might be Poa trivialis, a.k.a. Roughstalk Bluegrass.

You applied broad leaf "weed" poisons to a grass and those will not kill grasses. What will kill grasses are grass poisons, but they will also harm your Bermuda.

Veronica of some kind.

Thanks, all, for weighing in. Yup, NHBabs, this does appear sedge-like (or nutsedge-like, which is the only sedge I'm all too familiar with). I'm fairly certain it's not nutsedge as the root structure is different. So, gyr_falcon, will happily forego those lucky stars today! :) Probably not kyllinga -- one article describes these having waxy leaves, and mine are definitely nutsedgy glossy. jekeesl -- I'm always very careful to use a roots-and-all approach when weeding (Mom and Dad taught us well -- we kids spent many, many a weekend pulling weeds in the yard!), as opposed to plucking the tops (which I have indeed read may stimulate growth). Because they're interspersed in the lawn, I can't use an herbicide. And leaving them untouched wasn't an option as it was apparent the St. Aug was struggling to gain territory. I will run this past the County Extension -- thanks again!