Unlike most other members of Cypripedium, the pouch of C. acaule opens in a slit that runs down the front of the labellum rather than a round opening.
The plant consists of two plicate leaves near the ground.
A long, pubescent stalk bears a single pink flower.
C. acaule grows in a variety of different habitats, including moist and dry soils. It is usually found in pine forests, where it can be seen in large colonies, but it grows in deciduous woods, as well. It is nearly always found in soil with high acid content.
This page is a profile for the plant species Cypripedium acaule, used to collect records of where and when this plant was observed blooming, and for providing identification information for use in dichotomous keys. If you would like to help collect data for this or other plants, see Bloom clock project/How to Contribute for orientation.