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Thanks to Tim M. and this nice post: https://bodiehillsplants.com/2016/02/20/floral-mimicry-in-the-bodie-hills/ I was able to identify the rust which I see in the yard every spring and used to be perplexed by it. Whatever these flies are appeared to be obtaining nutrients from it. They were swarming on it and actively licking the rust and were covering the plants all day long, daily. Other insects made only brief visits and realized it wasn't a flower.