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Mentzelia nuda
2-4 ft tall, large white flowers, not fully open when photo taken at mid morning
Grassy roadside
Possibly jimsonweed? Poisonous, but some were growing inside a fenced cow pasture.
It is listed in Kansas Wildflowers and Grasses. www.kswildflower.org
Or http://www.pbase.com/richarda/image/6577...
I cant really tell what this is, but I don't think it's a Jimsonweed. They have fairly large, soft hairy leaves, and their blooms are a large trumpet.