Studied by Haw. in Syn. Pl. Succ., 44 (1812).
- Albers & Meve, Asclepiadaceae

Asclepiadaceae

According to APG II, the Asclepiadaceae is a former plant family now treated as a subfamily in the Apocynaceae...

 (2002): this genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 is valid. Found in South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

 & Tropical Africa

Africa

Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...

. Well defined by disc-like corona (unique in family) and stipitate gynostegium. 17 species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 recognised. Etymology

Etymology

Etymology is the study of the history of words, their origins, and how their form and meaning have changed over time.For languages with a long written history, etymologists make use of texts in these languages and texts about the languages to gather knowledge about how words were used during...

: for Henri Auguste Duval (1777–1814) French

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 physician

Physician

A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 and botanist. Closely related to Huernia

Huernia

The genus Huernia The genus Huernia The genus Huernia (family Asclepiadaceae consists of some (30-)60 species of stem succulents from Eastern and Southern Africa. The flowers are five-lobed, usually somewhat more funnel- or bell-shaped than in the closely related genus Stapelia, and often striped...

. The genus was established in 1812 by Haworth to include 3 species [from the then Stapelia

Stapelia

The genus Stapelia consists of around 40 species of low growing, spineless, stem succulent plants, predominantly from South Africa. The flowers of certain species, most notably Stapelia gigantea, can reach 41 cm in diameter when fully open...

, S caespitosa, S. elegans, and S reclinata] W&S recognised 15 species in 1937, Duvalia now contains 22 species, it is also the most widely distributed of all the "southern Duvalias"