What is "ypsilopus"

Ypsilopus is a genus of flowering plants from the orchid family, Orchidaceae native to Africa.

1. Ypsilopus erectus (P.J.Cribb) P.J.Cribb & J.Stewart - Tanzania, Mozambique, Malawi, Zambia, Zimbabwe, South Africa
2. Ypsilopus leedalii P.J.Cribb - Tanzania
3. Ypsilopus liae Delep. & J.-P.Lebel - Rwanda
4. Ypsilopus longifolius (Kraenzl.) Summerh. - Tanzania, Kenya
5. Ypsilopus viridiflorus P.J.Cribb & J.Stewart - Tanzania