This showy member of the Orchid family has large, magenta-colored flowers blooming between late April to May in Ohio, where it's listed as rare. It's found in a variety of habitats in the eastern US, including rocky/mossy slopes and semi-open spots with humusy, well-drained soils. It does well in dry, acidic soils.  It grows 6 to 10 inches tall with a pair of thick, prominently veined leaves framing a single, flowerless stalk topped with a puffy, pink flower lightly streaked with purple. The flower contains a slit that allows its primary pollinators--bumble bees--to enter and do their work. Charles Darwin wrote about this particular pollination in his seminal work, On the Origin of Species. 
 
Works well as a container plant as well as in woodlands and areas with protection from afternoon sun.
 
Plant Characteristics:
Grows 4-10" tall.
 
Prefers part shade to dappled sun.
 
Prefers humusy, dry to moist, acidic, well-drained soils.
 
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Resources:
ODNR: https://ohiodnr.gov/discover-and-learn/plants-trees/flowering-plants/pink-ladys-slipper
 
USDA Forest Service: https://www.fs.usda.gov/wildflowers/plant-of-the-week/cypripedium_acaule.shtml