Peloric Orchid

Every now and then one finds a Spiranthes that exhibits "peloria," a phenomenon in which a plant that normally bears irregular flowers mysteriously produces regular flowers. These flowers normally do not open but nearly always develop seed capsules. They seem cleistogamous to me. I have no expertise on this occurrence but would love to hear from anyone who does. The plant in the photo was among a large population of Spiranthes cernua in Lake County, Indiana. Photographed 10-4-09.