What is "cyanastrum"

Cyanastrum is a genus of plants in the family Tecophilaeaceae, native to tropical Africa. It contains 3 currently recognized species:

1. Cyanastrum cordifolium Oliv. -- Nigeria, Cameroon, Equatorial Guinea, Gabon, Congo-Brazzaville, Zaire ( Congo-Kinshasa)
2. Cyanastrum goetzeanum Engl. -- Tanzania
3. Cyanastrum johnstonii Baker in D.Oliver & auct. suc. (eds.) -- Tanzania, Zambia, Mozambique, Zaire ( Congo-Kinshasa)