Pachypodium namaquanum

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Pachypodium namaquanum
Pachypodium namaquanum00.jpg
Pachypodium namaquanum [1]
Pachypodium namaquanum PICT2653.jpg
In Richtersveld National Park
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Gentianales
Family: Apocynaceae
Genus: Pachypodium
Species:
P. namaquanum
Binomial name
Pachypodium namaquanum
(Wyley ex Harv.) Welw.
Synonyms [3]
  • Adenium namaquanumWyley ex Harv.

Pachypodium namaquanum, also known as halfmens or elephants trunk, is a Southern African succulent plant in the family Apocynaceae . [3] [4] The genus name Pachypodium is from the Greek for 'thick foot', an allusion to its swollen base, while the species name namaquanum is a reference to Namaqualand.

Contents

Distribution

The succulent plant is native to the arid, rocky mountains of the Richtersveld in the Northern Cape of South Africa and in southern Namibia.

It is found in its greatest numbers in the Gariep Centre which has the greatest variety of succulents on earth. Rainfall here occurs mainly in winter and varies from 50 to 150 mm. Extremely arid conditions are to be found in the rain shadows of certain mountain ranges where the rainfall may be 15 mm or less. Thick fog moving inland from the Atlantic coast can add to the precipitation. Temperatures in summer may reach 50 °C.

Description

Pachypodium namaquanum is a succulent single-stemmed plant growing to 4 metres (13 ft) tall. The warty trunk, thickset at the base and tapering to the top, is densely covered in sharp spines. Where damaged, the trunk produces side-branches that immediately curve back to the vertical. The very top of the plant is usually bent to the north, similar to the South American cactus Copiapoa cinerea .

There is a crown or tuft of undulate leaves at the apex of the trunk during the growing season which is throughout the winter months.

The tubular velvet-textured flowers appear from August to October and result in twin seedpods in a V-shape. These split down one side to release the wind-dispersed plumed seeds. Seen from a distance, the plant has the appearance of a person trudging up a slope whence its common name of halfmens (Afrikaans for 'semi-human'). It is also called elephant's trunk. [5]

Conservation

The plant is CITES-listed as an Appendix 1 and 2 species, prohibiting trade unless the necessary certificates and permits have been obtained. The removal of this species by collectors poses a distinct threat to its survival.

Relationships

This plant belongs to the Apocynaceae family. There are 23 species of Pachypodium of which 18 occur in Madagascar and 5 in southern Africa - three of these are succulent spiny shrubs while Pachypodium lealii , also tree-sized, occurs in the Kaokoveld in Namibia.

Related Research Articles

<span class="mw-page-title-main">Apocynaceae</span> Dogbane and oleander family of flowering plants

Apocynaceae is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison. Members of the family are native to the European, Asian, African, Australian, and American tropics or subtropics, with some temperate members. The former family Asclepiadaceae is considered a subfamily of Apocynaceae and contains 348 genera. A list of Apocynaceae genera may be found here.

<i>Pachypodium</i> Genus of succulents

Pachypodium is a genus of succulent spine-bearing trees and shrubs, native to Madagascar and Africa. It belongs to the family Apocynaceae.

<i>Pachypodium lealii</i> Species of tree

Pachypodium lealii, the bottle tree, is a species of plant included in the genusPachypodium. The scientific name derives from the 19th century Portuguese geologist Fernando da Costa Leal, who described the bottle tree during an exploration in southern Angola.

<i>Pachypodium lamerei</i> Species of plant

Pachypodium lamerei is a species of flowering plant in the family Apocynaceae. It is a stem succulent, photosynthesizing mainly through its trunk, and comes from the island of Madagascar, off the east coast of Africa. It has large thorns and leaves mostly just at the top of the plant, and large, fragrant flowers. The species has become one of the best known pachypodiums in cultivation, being relatively easy to propagate and grow. In cultivation it is often marketed as the Madagascar palm, despite its not being a palm at all. A variety called "Ramosum" has been described. It is distinguished mostly by a dwarf growth habit and its more rounded corolla lobe.

Plants belonging to the genus Pachypodium vary widely from each other in some aspects, but also share a number of basic common traits. Each species is adapted to the specific environment which it inhabits, but all species of the genus share certain anatomical and metabolic traits, reflecting their common evolutionary ancestry.

The taxonomy of the Pachypodium genus is the study of the species and subspecies in the genus Pachypodium. There are currently 25 recognized species in the genus, of which 17 are shrubs and eight are trees.

Pachypodiumhabitats consist of isolated, specialized, micro–environmental niches, generally xeric, rocky, frost-free areas within parts of western Madagascar and southern Africa. Pachypodium species are often indifferent to the regional ecological, biotic zone of vegetation, a fact which explains some of Pachypodium morphology and architecture. The large scale vegetation zones are in some cases irrelevant to the micro-environments of Pachypodium, in the sense that the xeric niches may be embedded in larger mesic biomes.

<i>Aloidendron dichotomum</i> Species of tree

Aloidendron dichotomum, formerly Aloe dichotoma, the quiver tree or kokerboom, is a tall, branching species of succulent plant, indigenous to Southern Africa, specifically in the Northern Cape province of South Africa, and parts of Southern Namibia.

<i>Adenium</i> Genus of flowering plants

Adenium is a genus of flowering plants in the family Apocynaceae first described as a genus in 1819. It is native to Africa and the Arabian Peninsula.

<span class="mw-page-title-main">Richtersveld</span> Desert in South Africa

The Richtersveld is a desert landscape characterised by rugged kloofs and high mountains, situated in the north-western corner of South Africa’s Northern Cape province. It is full of changing scenery from flat, sandy, coastal plains, to craggy sharp mountains of volcanic rock and the lushness of the Orange River, which forms the border with neighboring Namibia. The area ranges in altitude from sea level, to 1,377 m (4,518 ft) at Cornellberg. Located in the north-western side of the Northern Cape province in South Africa, the Richtersveld is regarded as the only arid biodiversity hotspot on earth and the majority of the area is inscribed on UNESCO's World Heritage List due to its cultural values.

<i>Aloidendron pillansii</i> Species of tree

Aloidendron pillansii, formerly Aloe pillansii, the giant quiver tree or bastard quiver tree, is a large, branching species of succulent plant indigenous to southern Africa. It is regarded as critically endangered.

<i>Faurea</i> Genus of flowering plants

Faurea is a genus containing 16 species of flowering plants in the protea family which occur in the summer rainfall area of southern Africa, extending to tropical Africa and Madagascar. The name honours South African soldier and botanist William Caldwell Faure (1822-1844) who was killed on active service in India.

<i>Tridentea pachyrrhiza</i> Species of plant

Tridentea pachyrrhiza is a species of plant in the family Apocynaceae that is native to Namibia and South Africa.

<span class="mw-page-title-main">Namaqua National Park</span> South African national park in Namaqualand in the Northern Cape

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<span class="mw-page-title-main">ǀAi-ǀAis/Richtersveld Transfrontier Park</span> Transfrontier park in Namibia and South Africa

The ǀAi-ǀAis/Richtersveld Transfrontier Park is a peace park straddling the border between South Africa and Namibia. It was formed in 2003 by combining the Namibian ǀAi-ǀAis Hot Springs Game Park and the South African Richtersveld National Park. Most of the South African part of the park forms part of the buffer zone of the Richtersveld Cultural and Botanical Landscape World Heritage Site, which measures 5,920 square kilometres (2,290 sq mi). The Fish River Canyon, the largest canyon in Africa, is located in the park. A memorandum of understanding was signed on 17 August 2003 by the presidents of South Africa and Namibia, which formalised the establishment of the park. |Ai-|Ais is Khoekhoe for fire-fire, meaning 'hot as fire' or 'scalding hot' named after the hot springs of the same name.

<i>Aloe pearsonii</i> Species of succulent

Aloe pearsonii is a very distinctive and unusual species of aloe, that is naturally endemic to the arid Richtersveld area on the border between South Africa and Namibia.

<i>Pachypodium rosulatum</i> Species of flowering plant

Pachypodium rosulatum, common name elephant's foot plant, belongs to the family Apocynaceae.

<i>Gasteria pillansii</i> Species of succulent

Gasteria pillansii, the Namaqua gasteria, is succulent plant native to the arid winter-rainfall regions in the far west of South Africa and Namibia.

<i>Pachypodium bispinosum</i> Species of shrub

Pachypodium bispinosum is a succulent sub-shrub in the family Apocynaceae.

<i>Tylecodon paniculatus</i> Species of succulent

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.

References

  1. painting possibly by Robert Jacob Gordon circa 1780
  2. Timberlake, J.R. (2021). "Pachypodium namaquanum". IUCN Red List of Threatened Species . 2021: e.T31142A146814359. doi: 10.2305/IUCN.UK.2021-3.RLTS.T31142A146814359.en . Retrieved November 24, 2024.
  3. 1 2 "Pachypodium namaquanum (Wyley ex Harv.) Welw". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved November 24, 2024.
  4. "Pachypodium namaquanum (Wyley ex Harv.) Welw". Catalogue of Life. Species 2000. n.d. Retrieved November 24, 2024.
  5. Mannheimer et al. (eds.): Wildflowers of the southern Namib, 2008, ISBN   978-99916-0-878-5, p.186; Top 10 Ugly Plants.