Yellow lady’s slipper (Cypripedium calceolus)

Two varieties of Yellow Lady-slippers in Minnesota. Perennial to 23″ tall. One to several stems in a clump. Leaves 2 to 6 per stem, ovate, 3″-8″ long. One to two flowers per stem; flowers with conspicuous yellow inflated pouch (or lady?s slipper); bloom in May-June. Found most often in mesic (moderate moisture) hardwoods and conifer swamps, occasionally in roadside ditches.
Source: MN DNR

Yellow lady's slipper (Cypripedium calceolus)

Yellow lady's slipper, Bemidji MN
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Shot taken with a Nikon D7000 set on aperture (AE) priority using a 70-200mm F2.8 EX DG APOMacro HSM II lens. The exposure was taken at 70mm, f/2.8 for 1/100th of a second at ISO 100. Post capture processing was done in Adobe’s Lightroom 3.