This is a somewhat variable species, with flowers ranging from red through pink to white. The reddish pink shown here is perhaps the most common.
There are a number of photos of S. sellovii on the site:
S. sellovii yellowish form, available light and flash
S. sellovii shown at AGGS Convention 2004, flowers and whole plant/tuber
S. sellovii photos at the Smithsonian, flowers and stems
S. sellovii flowers, Toronto show 2004
S. sellovii with hummingbird