Thanks, Chris and Tiffany. I bought the seeds from Vjotech Holubec, one of the Czech alpine seed collectors. Interesting provenance to the seeds - they were collected on Karlik Shan, a mountain in the Tien Shan range in China, near Xinjiang. I've sent seeds from it into the NARGS and SRGC seed exchanges, so it may become more widely grown with time. Both the plant itself (a small rosette) and the flower have been beautiful in the rock garden.