Children (9 direct children, 9 direct and indirect children):
Sphenophyllum angustifolium
Sphenophyllum bifurcatum
Sphenophyllum cuneifolium
Sphenophyllum emarginatum
Sphenophyllum erosum
Sphenophyllum myriophyllum
Sphenophyllum saxifragaefolium
Sphenophyllum schlotheimi
Sphenophyllum thoni