Here's the second round of roadside flower pictures from our trip last Thursday. As with the previous group, pictures will be clearer and more detailed if opened in separate windows, and I encourage people who know any of the unidentified plants in the post to speak up.
UPDATE: I think there's a good chance that this is Pastinaca sativa, wild parsnip.
UPDATE: Almost certainly Melilotus alba, white sweet clover. Thanks to Hugh.
UPDATE: Probably Tradescantia ohiensis, not an Allium. Which is kind of a relief. Hat tip to Claude.
UPDATE: I think this last one is probably Verbena stricta, or hoary vervain. Partly this is because the flower spikes seem to be longer than in Verbena hastata, which is the next closest species, but also because the davesgarden.com photo I linked to includes the detail that it's a roadside weed in Missouri. Thanks to RJ Flamingo for pointing me in a verbenerly (verbeasterly?) direction.