In many ways similar to P. alpicola, but with a different leaf base and more slender, less broad flowers held in one whorl. Though the leaves are described as having a cordate base, they may also have subcordate, oblique or rounded bases which are abruptly decurrent, even on the same plant. P. didyma is a red flowered species similar in every way to P. reticulata, found in Nepal. P. speciosa is likely to be the same as P. didyma but the material on which it was based no longer exists. The Flora of China lists P. reticulata for Myanmar (Burma), but this needs to be checked.