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I seem to run into something like this plant occasionally--seems to be around this stage-(not even sure if this is in seed, or still flowering- maybe that's why I never see it 'in flower' it is!)- I should have looked more closely rather than just taking a photo! This is an open medium/dry area (hard call on roadside ditches- plants could be up a bank where it looks dry, but might have roots down to the moister bottom) and the plant could be native or could easily be an agricultural weed.. I can do a closer view from the same shot if its helpful, but I don't have any other angles..
