Ypsilopus Summerh. in Kew Bull. 4: 439 (1949).
Epiphytic monopodial herbs with short stems; roots arising from the stem base. Leaves forming a fan, linear, articulated to short persistent leaf bases. Inflorescences racemose, arising from the stem base; flowers white or pale green. Sepals and petals subsimilar. Lip entire or obscurely 3-lobed, ecallose, spurred at the base. Column short. Rostellum geniculate and recurved at the base, 2-lobed.Pollinia 2, subglobose; stipes 1, Y-shaped; viscidium large, reniform or oblong.
Type species:
Ypsilopus longifolius (Kraenzl.) Summerh.
Kenya to S. Africa.

Ypsilopus erectus (P.J.Cribb) P.J.Cribb & J.Stewart Tanzania to Cape Prov.
Ypsilopus leedalii P.J.Cribb SW. Tanzania.
Ypsilopus liae Delp. & J.-P.Lebel SW. Rwanda.
Ypsilopus longifolius (Kraenzl.) Summerh. Kenya to NE. Tanzania.
Ypsilopus viridiflorus P.J.Cribb & J.Stewart Tanzania (Mt. Meru, W. Usambara Mts.).

Bibliography and References:
Carlsward BS, Stern WL, Bytebier B. 2006 Comparative vegetative anatomy and systematics of the angraecoids (Vandeae, Orchidaceae) with an emphasis on the leafless habit. Bot. J. Linn. Soc. 151. 165-218. Pottinger M. 1982 African orchids: Plectrelminthus to Ypsilopus. Orchid Rev. 90. (1070): 384-385 (1982). WCSP (2017). 'World Checklist of Selected Plant Families. 15.03.2017;