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Ceratogastra ornata
I saw several of these small wasps ovipositing into these plants. Unfortunately, I don't know the ID of the plant. :-(
Mixed prairie
Ok, I learned that the female wasps of this species are ovipositing in eggs or caterpillars of moths that lay their eggs in flower buds. The caterpillars eventually become cutworms. More here in the blog post I just published: http://bugeric.blogspot.com/2013/12/ichn...
Ok, and the plant looks like genus Ambrosia, but the wasp is presumably not phytophagous, so what is the host??
My guess is oviposition. (?) I saw 3 different wasps eliciting this behavior on the same species of plant.