''Tylecodon wallichii'' is a

species In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...

succulent plant In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word ''succulent'' comes from the Latin word ''sucus'', meani ...

in the genus ''

Tylecodon ''Tylecodon'' is a genus of succulent plants in the family Crassulaceae, native to southern Africa. Until the late 1970s all these plants were included in the genus ''Cotyledon'', but in 1978 Helmut Toelken of the Botanical Research Institute, P ...

'' belonging to the family

Crassulaceae The Crassulaceae (from Latin ''crassus'', thick), also known as the stonecrop family or the orpine family, are a diverse family of dicotyledon flowering plants characterized by succulent leaves and a unique form of photosynthesis, known as Cr ...

. The species is named in honour of

Nathaniel Wallich Nathaniel Wolff Wallich FRS FRSE (28 January 1786 – 28 April 1854) was a surgeon and botanist of Danish origin who worked in India, initially in the Danish settlement near Calcutta and later for the Danish East India Company and the Briti ...

, early 19th century Danish plant hunter, botanist and physician.

Description

''Tylecodon wallichii'' is a low sparsely branched shrublets reaching a height of about 50 cm (up to 1 m) with a single thick succulent stem up to 6 cm in diameter. Greyish branches are densely covered with residual leaf bases (phyllopodia) up to 1.5 cm long and crowded leaves on their tips. Leaves are yellowish to ash-green, hairless, ascending, slightly curved inward, tapering towards the apex, with a shallow groove along upper side, 6.5 — 9.5 cm (up to 15 cm) long. Plants blossom during summer, producing spreading to pendent clusters of dangling yellowish-green, urn-shaped flowers of 7-12 mm long with spreading to recurved lobes. Hybridises with

Tylecodon paniculatus ''Tylecodon paniculatus'', also known as butter bush, butter tree, butterboom or rooisuikerblom (Afrikaans), is a species of succulent plant in the genus ''Tylecodon'' belonging to the family Crassulaceae. Etymology The genus name is a syllabi ...

Distribution

Gravelly or sandy slopes of South

Namibia Namibia (, ), officially the Republic of Namibia, is a country in Southern Africa. Its western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and e ...

and

RCA The RCA Corporation was a major American electronics company, which was founded as the Radio Corporation of America in 1919. It was initially a patent pool, patent trust owned by General Electric (GE), Westinghouse Electric Corporation, Westin ...

from

Namaqualand Namaqualand ( khoekhoe: "Nama-kwa" meaning Nama Khoe people's land) is an arid region of Namibia and South Africa, extending along the west coast over and covering a total area of . It is divided by the lower course of the Orange River in ...

into the

Great Great may refer to: Descriptions or measurements * Great, a relative measurement in physical space, see Size * Greatness, being divine, majestic, superior, majestic, or transcendent People * List of people known as "the Great" *Artel Great (born ...

and

Little Karoo The Karoo ( ; from the Afrikaans borrowing of the South Khoekhoe !Orakobab or Khoemana word ''ǃ’Aukarob'' "Hardveld") is a semi- desert natural region of South Africa. No exact definition of what constitutes the Karoo is available, so its ...

Toxicity

The plant contains

bufadienolide Bufadienolide is a chemical compound with steroid structure. Its derivatives are collectively known as bufadienolides, including many in the form of bufadienolide glycosides (bufadienolides that contain structural groups derived from sugars). Thes ...

-type

cardiac glycoside Cardiac glycosides are a class of organic compounds that increase the output force of the heart and decrease its rate of contractions by inhibiting the cellular sodium-potassium ATPase pump. Their beneficial medical uses are as treatments for co ...

cotyledoside which causes nenta poisoning ("krimpsiekte") in livestock.

Subspecies

* ''Tylecodon wallichii'' subsp. ''wallichii'' — South Namibia, RCA (

Northern Cape The Northern Cape is the largest and most sparsely populated province of South Africa. It was created in 1994 when the Cape Province was split up. Its capital is Kimberley. It includes the Kalahari Gemsbok National Park, part of the Kgalagadi ...

) * ''Tylecodon wallichii'' subsp. ''ecklonianus'' (

Harv. William Henry Harvey, FRS FLS (5 February 1811 – 15 May 1866) was an Irish botanist and phycologist who specialised in algae. Biography Harvey was born at Summerville near Limerick, Ireland, in 1811, the youngest of 11 children. His fathe ...

)

Toelken Toelken is a surname. Notable people with this surname include: *Barre Toelken John Barre Toelken (June 15, 1935 – November 9, 2018) was an award-winning American folklorist, noted for his study of Native American material and oral traditions. ...

— South Namibia, RCA (Northern and

Western Cape The Western Cape is a province of South Africa, situated on the south-western coast of the country. It is the fourth largest of the nine provinces with an area of , and the third most populous, with an estimated 7 million inhabitants in 2020 ...

)

References

External links

World of Succulents

Bihrmann
{{Taxonbar, from=Q17759662 Plants described in 1978 Flora of South Africa Flora of Namibia wallichii