I am unsure if the type specimens at Berlin still exist. This species is close to Primula fernaldiana but differs by location, foliage and capsule length. It has a superficial resemblance to the European species P. frondosa and John Richards noted its resemblance to the Tibetan P. jaffreyana ( which is distinguished by having a 5 ribbed calyx). There is no distinction between the varieties. P. knuthiana is characterized by oblong-obovate to oblanceolate leaves, with a subrounded to obtuse apex, membranously winged petiole, crenate-denticulate margin, glabrous above, densely white farinose below. Scapes farinose towards the apex, with 2-30 pale violet flowers in an umbel, bracts linear-lanceolate, calyx campanulate, cut to just below the middle into triangular lobes without midveins.