Monotypic Caryophyllales genera

Ullucus is a genus of flowering plants in the family Basellaceae, with one species, Ullucus tuberosus, a plant grown primarily as a root vegetable, secondarily as a leaf vegetable. The name ulluco is derived from the Quechua word , but depending on the region, it has many different names. These include illaco (in Aymara), melloco (in Ecuador), chungua or ruba (in Colombia), olluco or papa lisa (in Bolivia and Peru), or ulluma (in Argentina).

Triphyophyllum peltatum is a facultatively carnivorous, up to tall vine in the monotypic genus Triphyophyllum in the family Dioncophyllaceae native to tropical western Africa, in Guinea, Ivory Coast, Liberia, and Sierra Leone where it grows in tropical rainforest.

Barbeuia madagascariensis is a liana found only on the island of Madagascar.

Fenestraria (known as '''babies' toes''') is a (possibly monotypic) genus of succulent plants in the family Aizoaceae, native to the Namaqualand in Namibia and the Cape Provinces of South Africa.

Agdestis is a genus of flowering plants containing a single species Agdestis clematidea, a vine native to Mexico & Central America, and introduced to Cuba, Puerto Rico, Florida, and Texas (though potentially native to the latter). Its common name rockroot refers to the large boulder-like root.

thumb | right | alt=Hypertelis cerviana | Hypertelis cerviana Hypertelis is a genus of flowering plants in the family Molluginaceae. Most of its former species have been transferred to the new genus Kewa, and the remaining species, Hypertelis spergulacea, may also need a different placement. Hypertelis spergulacea is a woody-based plant, up to high, with whorled greyish green leaves. It is found on the border between Namibia and the Northern Cape province of South Africa.

Enarganthe is a genus of flowering plants belonging to the family Aizoaceae. It contains a single species, Enarganthe octonaria, a succulent subshrub native to the western Cape Provinces of South Africa.

Hallianthus is a monotypic genus of flowering plants belonging to the family Aizoaceae. It only contains one species, Hallianthus planus

Saphesia is a monotypic genus of flowering plants belonging to the family Aizoaceae. Its only species is Saphesia flaccida.

Mossia is a monotypic genus of flowering plants belonging to the family Aizoaceae. It only contains one known species, Mossia intervallaris.

Didymaotus is a monotypic genus of flowering plant belonging to the family Aizoaceae, containing the single species Didymaotus lapidiformis. The plant is also known by the names stone plant and (Afrikaans for cow hoof). It occurs natively in the arid regions of Tanqua Karoo, near Ceres in the Western Cape. The generic name is taken from the Greek words didymos, meaning double, and aotus, meaning flower; the plant that bears two flowers. The specific epithet lapidiformis means stone-like, as it is not easily seen, blending in with its surroundings.

Pisoniella is a monotypic genus of flowering plants belonging to the family Nyctaginaceae. It only contains one known species, Pisoniella arborescens

Vanzijlia is a genus of flowering plants belonging to the family Aizoaceae. It only contains one known species, Vanzijlia annulata.

Plumbagella is a monotypic genus of flowering plants belonging to the family Plumbaginaceae. The only species is Plumbagella micrantha.

Stayneria (or 'white-flowered mesemb') is a genus of flowering plants belonging to the family Aizoaceae. It contains a single species, Stayneria neilii. It is in the subfamily Ruschioideae and the tribe Ruschieae.

Prepodesma is a monotypic genus of flowering plants belonging to the family Aizoaceae. The only species is Prepodesma orpenii.

Petiveria is a genus of flowering plants in the pigeonberry family, Petiveriaceae. The sole species it contains, Petiveria alliacea, is native to Florida and the lower Rio Grande Valley of Texas in the United States, Mexico, Central America, the Caribbean, and tropical South America. Introduced populations occur in Benin and Nigeria. It is a deeply rooted herbaceous perennial shrub growing up to in height and has small greenish piccate flowers. The roots and leaves have a strong acrid, garlic-like odor which taints the milk and meat of animals that graze on it.

Saharanthus is a monotypic genus of flowering plants belonging to the family Plumbaginaceae. The only species is Saharanthus ifniensis.

Ruschianthus falcatus is a species of plant in the family Aizoaceae. It is endemic to Namibia. Its natural habitat is rocky areas. It is the only species in the monotypic genus Ruschianthus.

Lyallia kerguelensis is a species of flowering cushion plant in the monotypic genus Lyallia of the family Montiaceae.

Nothosaerva is a monotypic genus of flowering plants in the family Amaranthaceae containing the single species Nothosaerva brachiata. It is native to India, Sri Lanka, Southeast Asia, and eastern Africa.

Aizoanthemopsis hispanica, or Spanish aizoon, is a species of flowering plant in the family Aizoaceae. It is the sole species in genus Aizoanthemopsis. It is a succulent native to northern Africa, the Mediterranean region and the Middle East where it grows on arid sandy plains, saline areas and in semi-arid habitats.

Wooleya is a monotypic genus of flowering plants belonging to the family Aizoaceae. It only contains one known species, Wooleya farinosa. It is also in tribe Ruschieae.

Halophytum ameghinoi is a species of herbaceous plant endemic to Patagonia. It is the only species in the genus Halophytum. It is a succulent annual plant, with simple, fleshy, alternate leaves. The plants are monoecious, with solitary female flowers and inflorescences of male flowers on the same plant .

Talinopsis is a genus of flowering plants in the family Anacampserotaceae. It has only one currently accepted species, Talinopsis frutescens, native to the US states on New Mexico and Texas, and northeast, central and southwest Mexico. A succulent, it uses C3 carbon fixation.

Cryptocarpus pyriformis which is commonly known as salt bush or monte salado is native to the Galápagos Islands as well as mainland Ecuador and Peru. It is the sole representative of the genus Cryptocarpus.

Jensenobotrya lossowiana is the only species of genus Jensenobotrya, in the family Aizoaceae. It is a succulent plant endemic to Namibia. Its natural habitat is rocky areas. It grows at Dolphin Head in Spencer Bay where it obtains moisture from the saline mists. It is threatened by habitat loss.

Decarya is a monotypic genus of flowering plants belonging to the family Didiereaceae. It has one species, Decarya madagascariensis, a shrub or tree endemic to southern Madagascar. It grows up to 6 meters in height, with zig-zagging branches covered in short spines. thumb It is native to Atsimo-Andrefana, Androy, and Anosy regions of southern Madagascar, where it is found between Toliara and Tolagnaro. It grows in dry spiny thicket or forest and in degraded thicket on limestone, from sea level to 400 meters elevation. It often grows with species of Didierea and Euphorbia. The plant is threaten

Reichenbachia is a genus of flowering plants belonging to the family Nyctaginaceae, the family that also includes Bougainvillea. The genus contains a single species, Reichenbachia hirsuta.Spreng.

Habropetalum dawei is a species of flowering plant belonging to the family Dioncophyllaceae. It is the sole species in genus Habropetalum.

Drosophyllum ( , rarely ) is a genus of carnivorous plants containing the single species Drosophyllum lusitanicum, commonly known as Portuguese sundew or dewy pine. In appearance, it is similar to the related genus Drosera (the sundews), and to the much more distantly related Byblis (the rainbow plants).

Ikonnikovia is a genus in the family Plumbaginaceae, containing only the species Ikonnikovia kaufmanniana, native to Kazakhstan, Kyrgyzstan, and Xinjiang in Central Asia.

Muiria hortenseae ("mouse-head") is a rare dwarf species of succulent plant of the iceplant family (Aizoaceae), indigenous to a very small area in the Little Karoo, Western Cape, South Africa. It is the only species in the monotypic genus Muiria.

Dioncophyllum is a monotypic genus of flowering plants belonging to the family Dioncophyllaceae. The only species is Dioncophyllum thollonii.

Phaulothamnus is a genus of plants formerly included in the family Phytolaccaceae but now considered a part of the Achatocarpaceae.

Lemonanthemum zygophylloides is a species of flowering plant in the family Aizoaceae. It is a succulent subshrub endemic to the southwestern Cape Provinces of South Africa. It is the sole species in genus Lemonanthemum.