What is "monocymbium"

Monocymbium is a genus of African plants in the grass family.

1. Monocymbium ceresiiforme (Nees) Stapf - widespread in sub-Saharan Africa from Liberia to Ethiopia to Cape Province
2. Monocymbium deightonii C.E.Hubb. - Guinea, Sierra Leone, Ivory Coast, Liberia
3. Monocymbium lanceolatum C.E.Hubb. - Guinea, Sierra Leone