Lye KA (1982) Studies in African Cyperaceae 23. New taxa and combinations in Fimbristylis Vahl II. Nordic Journal of Botany 2(4): 333-335. doi: 10.1111/j.1756-1051.1982.tb01197.x.
There is no corrections for Fimbristylis ferruginea subsp. sieberiana yet.