This species was described from several collections made in in the Kaghan and Siran valleys in Pakistan. It is also distibuted into Swat and adjoining Kashmir. It grows on moist rock clefts. This species is highly variable in size and number of flowers. Originally compared with P. jaffreyana but distinguished by geography, by exannulate flowers and by insertion of the stamens lower in the tube. Later compared with the Eastern species P. sharmae but differing by having white farina and P. stenocalyx, but differing by exannulate flowers and the smaller campanulate calyx. Leaves spathulate to obovate, rounded apex, winged petiole, crenate to denticulate margin and covered below with white farina. Flowers are purple, exannulate with a long tube 2-3x the calyx. As a holotype was not specified in the description, several syntypes were designated by Nasir but are not all identified by the appropriate herbariums and so there are few sheets available online. See also P. inayatii, another species from Northern Pakistan.