Barbata (or Sigmatopetalum) (Though 'Maudiae-type' is a purely horticultural designation it basically falls within Barbata) The Sigmatopetalum group of Paphiopedilum orchids includes species with mottled leaves and distinctive slipper-shaped flowers, often with wavy or twisted petals. These orchids are typically small to medium in size, grow in warm to intermediate conditions, and usually produce single flowers. Notable species include venustum, callosum, sukhakulii, appletonianum.