However, today the defining characteristics of the genus are generally accepted to be the absence of both stigmatic processes (typical in Habenaria) and ovoid root-tuberoids (characteristic of both Habenaria and Orchis). Still, P. nivea, P. clavellata and P. integra all have stigmatic processes, showing the limitations of morphological characteristics in defining this clade.
Today, the genus is primarily characterized by the absence of both stigmatic processes (typical in Habenaria) and ovoid root-tuberoids (characteristic of both Habenaria and Orchis). Nonetheless, P. nivea, P. clavellata, and P. integra all exhibit stigmatic processes, underscoring the limitations of morphological features in defining this clade.