Yellow Lady-Slipper (Cypripedium parviflorum var. makasin)!
Donald Drife (aka. Michigan Nature Guy) has a nice writeup on Michigan's Lady-Slippers. Its worth a read. He describes the varieties that can be found, and where to look for them in Michigan. The plants are found all over the state w/ the var. makasin (also called Smaller Yellow Lady-Slipper) mainly found in the southern lower peninsula. With the property here at Brownton Abbey part of the historic Sibley Prairie this area of Brownstown is ripe w/ rare plants not found anywhere else in the State of Michigan!
So, congratulations Judy and Larry. Had the one plant I found been a couple more feet to the left I'd be congratulating myself!
* - Technically, the property belongs to Gene and Cindy Quinlan a few doors down from us, so the orchids belong to them. Congratulations Gene and Cindy!