This przewalskii person must have been very important because his name is on all sorts of animals and plants. Unfortunately with salvias the name is used on to the wrong salvia as well as his own. Frequently hians turns out to be przewalksii. Hians is so rarely grown so there is not much correct seed available.
Przewalskii comes from China. It is a basal growth salvia with spikes of lovely purple flowers in spring. This salvia self seeds readily which is probably why it ends up with a number of different names.
There are no stems except flowering ones so propagation is by division or seed.