SERPENTINICUM (Werdermann) 't Hart, 1995.
Synonyms :
Umbilicus serpentinicus Werdermann (1938) / Rosularia serpentinica (Werdermann) Muirhead (1972)
Distribution : South-western Turkey.
Vegetatively close ta P. chrysanthum and P. muratdaghense.
Two varieties :
Prometheum serpentinicum var. giganteum (Eggli) 't Hart, 1999