Monotypic Gentianales genera

Pteleocarpa is a genus of flowering plants. The only member of the genus is the western Malesian tree Pteleocarpa lamponga. It has had a varied systematic history and has been placed in the families Icacinaceae, Cardiopteridaceae, Boraginaceae, and others. It has long been regarded as enigmatic. For example, its winged fruit is quite odd within the family Boraginaceae, where it was usually placed in the 2000s. The family name Pteleocarpaceae had been used, but was not validly published until 2011, when the required description was published in Kew Bulletin. A morphological study of Pteleocarpa

thumb|left|Female carpenter bee, Xylocopa caffra visiting Orphium fruitescens

Obolaria is a genus of flowering plant in the gentian family Gentianaceae. It is monotypic, being represented by the single species Obolaria virginica, commonly known as Virginia pennywort.

Ixanthus is a monotypic plant genus in the family Gentianaceae. The sole species, Ixanthus viscosus, is endemic to Canary Islands laurel fields and displays small yellow flowers when in bloom.

Saccifolium is a monotypic genus of flowering plants belonging to the family Gentianaceae. The only species is Saccifolium bandeirae.

Microrphium is a monotypic genus of flowering plants belonging to the family Gentianaceae. The only species is Microrphium pubescens.

Pycnosphaera is a monotypic genus of flowering plants belonging to the family Gentianaceae. The only species is Pycnosphaera buchananii.

Hockinia is a monotypic genus of flowering plants belonging to the family Gentianaceae. The only species is Hockinia montana. It is native to south-eastern Brazil.