Dorotheantheae

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Dorotheantheae
Dorotheanthus bellidiformis-P9200029.jpg
Cleretum bellidiforme
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Aizoaceae
Subfamily: Ruschioideae
Tribe: Dorotheantheae
Type genus
Dorotheanthus
Genera

CleretumN.E.Br.

Dorotheantheae is a small tribe of annual succulents in the Aizoaceae subfamily Ruschioideae. Though it originally comprised three genera (Aethephyllum, Cleretum , and Dorotheanthus),Cleretum remains as the only recognised genus. Dorotheantheae are endemic to the western and south-western parts of South Africa. The type genus is Dorotheanthus, [1] despite it being no longer recognised.

Contents

Distribution and description

Cleretum papulosum, displaying the water storage cells in the leaves. Cleretum papulosum - Flickr - Kevin Thiele (1).jpg
Cleretum papulosum , displaying the water storage cells in the leaves.
Artwork of Cleretum pinnatifidum, from The Botanical Magazine, showing the lyrate leaf shape. BotMag2(67).jpg
Artwork of Cleretum pinnatifidum , from The Botanical Magazine , showing the lyrate leaf shape.

Species in the Dorotheantheae tribe are endemic to the south and southwest areas of South Africa, specifically the Cape Floristic Region and Succulent Karoo Region, [2] or "Greater Cape Flora", [3] an area that sees great diversity in its flora, though, remains distinct. [4] In turn, this means the location of individual species can range from as north as Namaqualand to as east as Plettenberg Bay. The species most commonly appear in flat and open areas, occasionally with the land consisting of loam or sand. [2]

All species are annual succulent herbs. The difference in appearance between each of the tribe's four formerly recognised clades is usually minor. The leaf shape is spathulate, with the exception of those that were members of the Aethephyllum clade, with those having lyrate leaves. All species have visible bladder cells, typically described as "moderately raised". [2] The pedicel is either long or short and there is distinct variation between clades for the vibrancy and colouration of the flower and its conspicuousness. Additionally, the diameter of the flower ranges from large to small. [2]

All species have papillate seed surfaces, besides those that were in the Dorotheanthus subg. Dorotheanthus clade. [2]

Genera

There is only one recognised genus in the Dorotheantheae tribe, per Plants of the World Online: [5]

Previously, another two genera were recognised as being members of this tribe: [6]

In a molecular study completed by Cornelia Klak and Peter V. Bruyns in 2012 and published in the scientific journal Taxon , titled "Phylogeny of the Dorotheantheae (Aizoaceae), a tribe of succulent annuals", it was found that Dorotheantheae consisted of four clades: [2] [7] the aforementioned three modified to have Dorotheanthus split in two, introducing D. subg. Dorotheanthus and D. subg. Pherolobus . [2] Additionally, it was proved that the genus Cleretum was not monophyletic, as circumscribed in 1987, and hence some species were better suited under the genus Aethephyllum. Following this, it was argued that "fruit morphology" was unreliable for discerning genera in the family Aizoaceae; the most common manner was to consider combinations of homoplasious characteristics. [2] This method was considered by Klak and Bruyns to be "not necessarily justified", with it being the only differentiating factor between the Cleretum and Dorotheanthus clades. [2] Hence, despite there being aspects allowing for the recognition of Dorotheanthus and Aethephyllum, though they "remain[ed] difficult to distinguish", the conclusions of the study were that while the tribe is adequately characterised, the factors differentiating each genus are indistinct or negligible and should be reduced to only Cleretum due to that species' loose circumscription. [2]

Prior to the study, the genera Cleretum and Dorotheanthus were often confused, as noted in the "Aizoaceae A-E" edition of Heidrun Hartmann's 2001 book "Illustrated Handbook of Succulent Plants". [8]

Related Research Articles

<span class="mw-page-title-main">Crassulaceae</span> Family of flowering plants

The Crassulaceae, 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 Crassulacean acid metabolism (CAM). Flowers generally have five floral parts. Crassulaceae are usually herbaceous but there are some subshrubs, and relatively few treelike or aquatic plants. Crassulaceae are a medium size monophyletic family in the core eudicots, among the order Saxifragales, whose diversity has made infrafamilial classification very difficult. The family includes approximately 1,400 species and 34–35 genera, depending on the circumscription of the genus Sedum, and distributed over three subfamilies. Members of the Crassulaceae are found worldwide, but mostly in the Northern Hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce, although a few are aquatic.

<span class="mw-page-title-main">Aizoaceae</span> Family of dicotyledonous flowering plants

The Aizoaceae, or fig-marigold family, is a large family of dicotyledonous flowering plants containing 135 genera and about 1800 species. They are commonly known as ice plants or carpet weeds. They are often called vygies in South Africa and New Zealand. Highly succulent species that resemble stones are sometimes called mesembs.

<i>Mesembryanthemum</i> Genus of plants

Mesembryanthemum is a genus of flowering plants in the family Aizoaceae; like many members of this family, it is characterized by long-lasting flower heads. Flowers of Mesembryanthemum protect their gametes from night-time dews or frosts but open in sunlight. There is an obvious evolutionary advantage to doing this; where sun, dew, frost, wind or predators are likely to damage exposed reproductive organs, closing may be advantageous during times when flowers are unlikely to attract pollinators. It is indigenous to southern Africa.

<span class="mw-page-title-main">Succulent plant</span> Plants having some parts that are more than normally thick and fleshy

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, meaning "juice" or "sap".

<i>Glottiphyllum</i> Genus of succulents

Glottiphyllum is a genus of about 57 species of succulent subtropical plants of the family Aizoaceae. It is closely related to the Gibbaeum and Faucaria genera. The name comes from ancient Greek γλωττίς glottis "tongue" and φύλλον phyllon "leaf". The species are native to South Africa, specifically to Cape Province and the Karoo desert. They grow in rocks and soils incorporating slate, sandstone and quartz. Rainfall in their native areas is between 125 and 500 mm, most of which falls in March and November.

Cylindrophyllum comptonii is a species of succulent plant belonging to the genus Cylindrophyllum of the family Aizoaceae. It is endemic to South Africa.

<i>Cleretum bellidiforme</i> Species of flowering plant

Cleretum bellidiforme, commonly called Livingstone daisy, Bokbaaivygie (Afrikaans), or Buck Bay vygie, is a species of flowering plant in the family Aizoaceae, native to the Cape Peninsula in South Africa. It is a low-growing succulent annual growing to 25 cm (10 in), and cultivated for its iridescent, many-petalled, daisy-like blooms in shades of white, yellow, orange, cream, pink and crimson. In temperate areas it is popularly grown as a half-hardy annual, and lends itself to mass plantings or as edging plants in summer bedding schemes in parks and gardens. It is still widely referenced under its former names, Mesembryanthemum criniflorum and Dorotheanthus bellidiformis.

<i>Glottiphyllum cruciatum</i> Species of succulent


Glottiphyllum cruciatum is a rare species of succulent plant, of the family Aizoaceae. It is indigenous to arid areas near Oudtshoorn in the Western Cape, South Africa. The plant has many synonyms including Glottiphyllum angustum.

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

Piaranthus is a succulent plant genus in the subfamily Asclepiadoideae, in the family Apocynaceae.

<i>Euphorbia flanaganii</i> Species of flowering plant

Euphorbia flanaganii, commonly known as Transkei medusa's head, is a succulent plant that belongs to the family Euphorbiaceae. Due to the breadth of the Euphorbiaceae, little research specific to E. flanaganii has been conducted.

<i>Glottiphyllum regium</i> Species of succulent

Glottiphyllum regium is a rare species of succulent plant, in the family Aizoaceae. It is known locally as "koeispene". It is restricted to a small arid area near Calitzdorp in the Western Cape, South Africa.

<i>Glottiphyllum linguiforme</i> Species of succulent

Glottiphyllum linguiforme is a widespread species of succulent plant, of the family Aizoaceae, native to South Africa. It is the type species of the genus Glottiphyllum.

<i>Cleretum</i> Genus of succulents

Cleretum is a genus of flowering plants in the family Aizoaceae, native to the Cape Provinces of South Africa.

<i>Trichodiadema marlothii</i> Species of succulent

Trichodiadema marlothii is succulent plant of the genus Trichodiadema, native to the Western Cape Province, South Africa, where it is known from the Robertson and Swellendam areas.

<i>Trichodiadema intonsum</i> Species of succulent

Trichodiadema intonsum is succulent plant of the genus Trichodiadema, native to the Eastern Cape Province, South Africa.

<i>Trichodiadema mirabile</i> Species of succulent

Trichodiadema mirabile is succulent plant of the genus Trichodiadema, native to the Western Cape Province, South Africa, where it is known from the Laingsburg area and especially from south-facing slopes.

<i>Trichodiadema densum</i> Species of succulent

Trichodiadema densum is a succulent flowering plant in the fig-marigold family Aizoaceae, native to the Willowmore region of the Western Cape Province, South Africa.

<i>Neohenricia</i> Genus of Aizoaceae plants

Neohenricia is a genus of flowering plants in the family Aizoaceae, native to South Africa. Low-lying succulents, they are found in places that can collect a little water, such as crevices and pans, on sandstone or dolorite, in areas that get at least 200 mm of rainfall annually.

<i>Trichodiadema barbatum</i> Species of plant

Trichodiadema barbatum is succulent plant of the genus Trichodiadema, native to the Eastern Cape Province, South Africa.

Stayneria 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.

References

  1. "U.S. National Plant Germplasm System - tribe Dorotheantheae". U.S. National Plant Germplasm System. Germplasm Resources Information Network . Retrieved 29 January 2019.
  2. 1 2 3 4 5 6 7 8 9 10 Klak, Cornelia; V. Bruyns, Peter (April 2012). "Phylogeny of the Dorotheantheae (Aizoaceae), a tribe of succulent annuals". Taxon . Wiley. 61, No. 2 (2): 293–307. doi:10.1002/tax.612002. JSTOR   23210522.
  3. Jürgens, Norbert (August 1997). "A New Approach to the Namib Region: I: Phytogeographic Subdivision". Vegetatio . Springer Science+Business Media. 97 (1): 25. JSTOR   20046079.
  4. Born, Julia; Linder, Peter; Desmet, Philip (October 2006). "The Greater Cape Floristic Region". Journal of Biogeography . Blackwell Publishing. 34: 147–162. doi:10.1111/j.1365-2699.2006.01595.x. S2CID   86163126.
  5. "Cleretum N.E.Br". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 29 January 2019.
  6. "Aizoaceae". The Plant List . Missouri Botanical Garden. Royal Botanic Gardens, Kew . Retrieved 29 January 2019.{{cite web}}: CS1 maint: others (link)
  7. Klak, Cornelia (December 2012). "Two New Species of Cleretum (Ruschioideae-Dorotheantheae, Aizoaceae) from the Northern Cape, South Africa". Haseltonia . Cactus and Succulent Society of America. 18: 27. doi:10.2985/026.018.0103. S2CID   84273622.
  8. Hartmann, Heidrun (2001). Illustrated Handbook of Succulent Plants: Aizoaceae A-E. Germany: Springer Science+Business Media. p. 129. ISBN   978-3-540-41691-3.