The third species, strict endemic H. chaiyrakanicum
Kurbatskij (1990) known only from two localities from Central Tuva, southern Siberia, is phenotypically closely related to H. setigerum
and could be classifiedin the same section, Subacaulia. H. chaiyrakanicum differs fromH. setigerum in its lighter pink flowers,
fewer leaflets and fewer pod (lomentum) segments.