Erect to pendent epiphytic herbs. Roots from basal part of stem, not branching. Stem less than 6 cm long. Leaves arranged in a fan, linear, conduplicate or twisted at base to lie in one plane, articulated to persistent leaf bases, leaving sharp, acuminate points when leaves fall. Inflorescence usually shorter than leaves, racemose, few- to many-flowered; peduncle and rachis terete; bracts amplexicaul. Flowers white or pale green, with spreading perianth parts, scabrid on outer surface. Sepals and petals free, subsimilar. Labellum entire or obscurely trilobed, ecallose, spurred at base. Column terete; pollinia two, subglobose, tegula solitary, Y-shaped, viscidium reniform or oblong; rostellum geniculate and recurved at base, bilobed, usually dilated and scutelliform at apex. Ovary scabrid.
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.
Erect to pendent epiphytic monopodial herbs with short stems, less than 6 cm. long; roots from basal part of stem, not branching. Leaves arranged in a fan, linear, conduplicate or twisted at the base to lie in one plane, articulated to short persistent leaf-bases, leaving sharp acuminate points when the leaves fall. Inflorescences usually shorter than the leaves, racemose, laxly few–many-flowered; peduncle and rhachis slender, terete; bracts amplexicaul, rather small. Flowers white or pale green, with spreading segments, scabrid on outer surface and on ovary. Sepals and petals free, subsimilar. Lip entire or obscurely 3-lobed, ecallose, long-spurred at the base. Column short, terete; rostellum geniculate and recurved at base, 2-lobed, usually dilated and scutelliform at the apex; pollinia 2, subglobose; stipes solitary, slender, Y-shaped; viscidium large, reniform or oblong.
Ypsilopus erectus (P.J.Cribb) P.J.Cribb & J.Stewart and Y. longifolius are epiphytic in evergreen forests, Juniperus L. and Widdringtonia Endl. (Cupressaceae) forests, Brachystegia Benth. (Fabaceae) and Uapaca Baill. (Euphorbiaceae) woodlands, and on Albizia Durazz. (Fabaceae) and Erythrophloem Benth. (Fabaceae). Ypsilopus viridiflorus is also epiphytic in montane forests. All are found at 1450– 2500 m elevation.