The species appears to be fairly distinct in the ovate-lanceolate calyx lobes and ± triangular, ciliate throat scales. Closely related to
Pseudomertensia chitralensis, from which it differs in the indumentum (hairs larger and spreading), leaves thickish, with petiole less differentiated, broader calyx lobes and throat scales which are larger, triangular and shortly ciliate (not narrow oblong and eciliate).
The filament size in the type material is 1.8 mm long and not 0.5 mm as noted in the description (Kazmi, l.c. 376); besides, the filaments are attached c. 8 mm from corolla base and not 3-6 mm as mentioned by Kazmi (l.c.). The speci-mens from Gilgit (op. cit.) have smaller corollas, but agree in other respects to Pseudomertensia drummondii.