P. annulata is endemic to NW Yunnan and was first collected in 1913 on a limestone peak near Deqin. It may not have been seen since. It is a small species, to 3.5 cm, with violet flowers, usually 1 per stem. Grows in mossy loose soils. If you have an image of this species, please contact the webmaster. 如果你有这个物种的图像,请与网站管理员联系。