Peloric flowers are radially symmetric flowers appearing on plants that normally have zygomorphic (laterally symmetric) flowers. Most orchid flowers are zygomorphic because the lip is so different from the other flower parts.
The term is used in orchids to refer to petals (or here, sepals) that have lip-like characteristics. The best orchid example I can think of is in Cattleya intermedia, or any of the peloric Phalaenopsis. Look up the normal flowers, then the peloric flowers.
Most so-called peloric orchid flowers are not truly peloric because the other two petals are usually not identical to the lip.
In this case the characteristic is the lighter stripe down the centers of the lower two sepals. The lip, however, doesn't have this stripe.
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