Gymnocarpium disjunctum is supposed to be the common one, but so far I’ve only been able to find and photograph Gymnocarpium dryopteris. Is Indian River Valley atypical? am I blind? Is something else going on?
Perhaps some of Luzulas I’ve seen are not Luzula parviflora – probably should spend sometime looking when they’re actually up.
Check out the Stellaria spp around town. Not that many of them, and shouldn’t be hard to get a better handle on the common ones (or at least be able to narrow most of them down to a couple of options).