Most white flowering orchids have a last hint of colour in its petals, its spur or ovary. In these cases, the ability to produce pigments is clearly reduced, but obviously not totally suppressed. Studying albiflora species of Gymnadenia odoratissima in the Dolomite Alps, some plants show a rest of rose colour (left) while others still have a violet hue (right) – especially visible in the buds and in the ovary. At the slope of a meadows near the Schlern mountain there are about ten plants of Gymnadenia odoratissima with more or less white flowers.
It seems that there are different pigmets suppressed in both cases. Only plants with all colour pigments suppressed have totally white flowers. That is also clearly visible with Gymnadenia conopsea at the Puflatsch alm of the Dolomite alps.