References
  Correll, D.S. and M.C. Johnston. 1970. Manual of the Vascular Plants of Texas. Texas Research Foundation, Renner, Texas.
 
Luer, C.A. 1975. The Native Orchids of the United States and Canada excluding Florida. The New York Botanical Garden, New York, New York.

Poole, J.M. and D.H. Riskind. 1987. Endangered, Threatened or Protected Native Plants of Texas. Texas Parks & Wildlife   Department, Austin, Texas.

U.S. Fish and Wildlife Service. 1998 . U.S. Listed Plant Species Profiles [On-line]. Available
http://www.fws.gov/r9endspp/plants6.html#Lnk1n

U.S. Fish and Wildlife Service. 1993. Navasota Ladies' Tresses (Spiranthes parksii) Recovery Plan. USDI Fish and Wildlife Service, Albuquerque, New Mexico.

Images:
Flora of Texas Consortium. 1996. Texas Endemics: Distribution of Spiranthes parksii. [On-line]. Available:                  http://www.csdl.tamu.edu/FLORA/cgi/endemics_map_page?code=K4242000

Texas A&M Bioinformatics Working Group. 1998. Vascular Plant Image Gallery. [On-line]. Available: http://www.csdl.tamu.edu/FLORA/imaxxorc.htm

Texas Parks & Wildlife Department. 1997. Navasota ladies'-tresses. [On-line]. Available http://www.tpwd.state.tx.us/nature/endang/navasolt.htm
 

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