Rattlesnake plantains are not actually plantains; they are orchids.

The leaves are an identifying feature of Rattlesnake Plantain

The leaves are close to the soil in circular arrangement (basal rosette) around a central growing point. The leaves Have a network of silvery veins and a broad stripe down the center. They resemble the skin of a rattlesnake. Thus the name Rattlesnake Plantain.

Rattlesnake-plantains are evergreen. The individual leaves last up to four years.

All parts of the plant are covered with a very fine downy hair especially noticeable on the bloom spike.

It is noted that "One-sided Pyrola" has a similar flower stalk (before going to seed/berries) but different leaves.

Some Rattlesnake Plantain leaves have more mottling, but some are predominantly the single large stripe as shown in your photo. (Info from Sharon)