Habitat
S. parksii is found in the uplands of the Post Oak Savannah, a unique vegetation region in east-central Texas. Here it grows in eroded sites along drainages in the Navasota River Valley, usually only where elevations exceed 80 m (250 feet) above sea level (U.S. Fish and Wildlife Service, 1993).

Associated Species
The following is a list of woody plants commonly associated with S. parksii (USFWS, 1993):

Ilex vomitoria.....................................  Yaupon Holly
Quercus stellata..................................  Post Oak
Quercus marilandica..........................    Black Jack Berry
Vaccinium arboreum..........................    Tree Blue Berry
Callicarpa americana.........................    Beauty Berry
Ulmus alata........................................   Winged Elm
Forestiera ligustrina
Ilex decidua........................................    Deciduous Holly
Crateagus spathulata...........................    Hawthorne
 
 

S. parksii can either self-fertilize or sexually reproduce. The only observed pollinator of this orchid is the bumble-bee (Bombus sp.).