Spiranthes parksii, the Navasota ladies' tresses,[3] is a species of orchid that is endemic to Texas, United States.

Since then, biologists have identified the species in Bastrop, Burleson, Fayette, Freestone, Grimes, Jasper, Leon, Madison, Milam, Robertson, and Washington Counties.

[6] However, Texas Parks and Wildlife found that although there are a lot of genetic similarities between the two, that S. parksii differs in morphological characteristics and is considered a derivative of the more widely distributed S. cernua complex.

Further research[8] into the S. cernua complex also suggested evidence for more genetic differences, but testing is limited due to the vulnerable nature of S. parksii.

Navasota ladies' tresses was listed as an endangered species by the United States Fish and Wildlife Service (USFWS) in May 1982.