A species found in a large area along the border regions of North Burma (Myanmar), Arunachal Pradesh, SE Tibet and West Yunnan. It is a smaller plant than P. amethystina and has smaller flowers. The leaves are obovate with a winged petiole 1/2 to as long as the blade and a sharply denticulate margin. The flowers are campanulate, rose-purple to deep blue-purple and usually are 1-2 per stem but may be as much as 5. Grows in wet areas.