Or…parasitism. These plants are parasites on the roots of other plants (trees mainly), which they access through the network of largely mutualistic mycorrhizal fungi that exist in the soil.
This is Squaw root Conopholis americana (I showed a photo of it earlier this year, in scenes from the birding cup, which actually includes some quite pretty photos, now that I look back on it, haha!)
Here’s an info page on Squaw root from Penn State:
If I understand correctly, squawroot is able to grow directly on tree roots, unlike Indian Pipe which must take advantage of the fungi attached to the roots of trees.