Selenipedium Orchids are a 'slipper orchid' from Brazil. Species differ in flower coloring. S. aequinoctile has yellow flowers with an orange ro red lip around the slipper.
S. chica seems variable, flowers can be pure yellow, however the orange to red lip does appear eventully. S. isabelianum is perhaps the most widely available, red slippers on this one.
These are a tall growing orhcid with strappy leaves, individual plants can get to 6 ft tall when in full growth. All species have smallish flowers and a difficult one to grow for beginners, so look for a little advice from your local orchid club for this one.