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Commelina communis
Blue flower with 2 petals and long stigma. Anthers look to have small yellow flowers on them. About 1-1.5 feet tall.
Weedy old horse pasture.
The USDA Plant Database lists 2 Communis sp. - C. communis and C. erecta - for Michigan. This is C. communis.
See pics of C. erecta for comparison at: http://www.namethatplant.net/plantdetail...