Sarcocornia

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Sarcocornia is a formerly recognized genus of flowering plants in the amaranth family, Amaranthaceae. Species are known commonly as samphires, glassworts, or saltworts. [1] Molecular phylogenetic studies have shown that when separated from Salicornia , the genus is paraphyletic, since Salicornia is embedded within it, and Sarcocornia has now been merged into a more broadly circumscribed Salicornia. When separated from Salicornia, the genus has a cosmopolitan distribution, [2] and is most diverse in the Cape Floristic Region of South Africa. [3]

Contents

Description

Species formerly placed in Sarcocornia are perennial herbs, subshrubs or shrubs. [4] They are taking an erect or prostrate, creeping form. [5] The new stems are fleshy and divided into joint-like segments. Older stems are woody and not segmented. The oppositely arranged leaves are borne on fleshy, knobby petioles, their base decurrent and connate (thus forming the segments), the blades forming small, triangular tips with narrow scarious margin. [1]

Inflorescences of Salicornia pacifica, formerly Sarcocornia pacifica Sarcocorniapacifica.jpg
Inflorescences of Salicornia pacifica , formerly Sarcocornia pacifica

The terminal or lateral inflorescences are spike-like, made up of joint-like segments with tiny paired cymes emerging from the joints. Each cyme consists of three (rarely five) flowers completely embedded between the bract and immersed in the fleshy tissue of the axis. The flowers of a cyme are arranged in a transverse row, the central flower separating the lateral flowers, with tissue of the axis between them. The hermaphrodite or unisexual flowers are more or less radially symmetric, with a perianth of three or four fleshy tepals connate nearly to the apex, one or two stamens, and an ovary with two or three stigmas. [1]

The perianth is persistent in fruit. The fruit wall (pericarp) is membranous. The vertical seed is ellipsoid, with light brown, membranous, hairy seed coat, the hairs can be strongly curved, hooked, or conic, straight or slightly curved. The seed contains no perisperm (feeding tissue). [1]

The basic chromosome number is x=9. The species are diploid (18 chromosomes), tetraploid (36), hexaploid (54), or octoploid (72). [4]

Taxonomy

The genus Sarcocornia was first described in 1978 by A J Scott. [6] It separated the perennial species from the closely related annual Salicornia senus stricto, additionally containing some species formerly belonging to the former genus Arthrocnemum. The type species is Sarcocornia perennis . [7]

Sarcocornia/Salicornia began to evolve during the middle Miocene from ancestors in Eurasia, developing four phylogenetic lineages: the first was the Eurasian Sarcocornia clade, further diversifying into the American Sarcocornia clade, then the Salicornia clade, and the South African/Australian Sarcocornia clade. When Salicornia is separated from Sarcocornia to comprise all the annual, more frost tolerant species, the genus Sarcocornia is paraphyletic, since Salicornia evolved within Sarcocornia. [4] The prostrate, mat-forming growth seems to have evolved several times independently. It is probably advantageous in habitats with prolonged flooding, high tidal movement and frost. [4]

A molecular phylogenetic study in 2017 confirmed the paraphyly of Sarcocornia, and merged the genus into Salicornia. [8]

Selected former species

Accepted names in Salicornia are taken from Plants of the World Online. [9]

Related Research Articles

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

Amaranthaceae is a family of flowering plants commonly known as the amaranth family, in reference to its type genus Amaranthus. It includes the former goosefoot family Chenopodiaceae and contains about 165 genera and 2,040 species, making it the most species-rich lineage within its parent order, Caryophyllales.

<i>Salicornia</i> Genus of flowering plants in the family Amaranthaceae

Salicornia is a genus of succulent, halophytic flowering plants in the family Amaranthaceae that grow in salt marshes, on beaches, and among mangroves. Salicornia species are native to North America, Europe, Central Asia, and southern Africa. Common names for the genus include glasswort, pickleweed, picklegrass, and marsh samphire; these common names are also used for some species not in Salicornia. To French speakers in Atlantic Canada, they are known colloquially as titines de souris. The main European species is often eaten, called marsh samphire in Britain, and the main North American species is occasionally sold in grocery stores or appears on restaurant menus as sea beans, samphire greens or sea asparagus.

<span class="mw-page-title-main">Salicornioideae</span> Subfamily of flowering plants

The Salicornioideae are a subfamily of the flowering plant family Amaranthaceae. Important characters are succulent, often articulated stems, strongly reduced leaves, and flowers aggregated in thick, dense spike-shaped thyrses. These halophytic plants are distributed worldwide. Many are edible

<span class="mw-page-title-main">Chenopodioideae</span> Subfamily of flowering plants

The Chenopodioideae are a subfamily of the flowering plant family Amaranthaceae in the APG III system, which is largely based on molecular phylogeny, but were included – together with other subfamilies – in the family Chenopodiaceae, or goosefoot family, in the Cronquist system.

<i>Beta</i> (plant) Genus of flowering plants in the amaranth family Amaranthaceae

Beta is a genus in the flowering plant family Amaranthaceae. The best known member is the common beet, Beta vulgaris, but several other species are recognised. Almost all have common names containing the word "beet". Wild Beta species can be found throughout the Atlantic coast of Europe, the Mediterranean coastline, the Near East, and parts of Asia including India.

<i>Tecticornia</i> Genus of plants

Tecticornia is a genus of succulent, salt tolerant plants largely endemic to Australia. Taxa in the genus are commonly referred to as samphires. In 2007, the genus Halosarcia, along with three other Australian genera was incorporated into the genus.

<i>Salicornia quinqueflora</i> Species of plant

Salicornia quinqueflora, synonym Sarcocornia quinqueflora, commonly known as beaded samphire, bead weed, beaded glasswort or glasswort, is a species of succulent halophytic coastal shrub. It occurs in wetter coastal areas of Australia and New Zealand.

<span class="mw-page-title-main">Betoideae</span> Subfamily of flowering plants

The Betoideae are a small subfamily of the flowering plant amaranth family, Amaranthaceae sensu lato. Commonly known members include beet, sugar beet, chard, and mangelwurzel, which all are cultivars of Beta vulgaris.

<span class="mw-page-title-main">Camphorosmeae</span> Tribe of flowering plants

Camphorosmeae is a species-rich tribe of the Amaranthaceae, formerly Chenopodiaceae, with 20 genera and about 179 species. It is classified as a single tribe of subfamily Camphorosmoideae.

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

Halostachys is a genus of flowering plants in the plant family Amaranthaceae, containing a single species, Halostachys caspica. The plants are small to medium halophytic shrubs with apparently jointed fleshy stems and scale-like leaves. They are native to Asia and southeastern Europe.

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

Kalidium is a genus of flowering plants in the plant family Amaranthaceae. The species are shrubby halophytes distributed in Southeast Europe, Southwest Asia and Central Asia to China.

<i>Oxybasis</i> Genus of plants

Oxybasis is a flowering plant genus from the subfamily Chenopodioideae of the family Amaranthaceae. It was first described in 1841, and newly used since 2012 for five species that were traditionally grouped into genus Chenopodium. They occur in Europe, Asia, North Africa and America.

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

Allenrolfea is a genus of shrubs in the family Amaranthaceae. The genus was named for the English botanist Robert Allen Rolfe. There are three species, ranging from North America to South America.

Arthrocnemum was a genus of shrubs in the family Amaranthaceae. Two or three species were included in the genus. They are halophytes with fleshy, apparently articulated plant stems and reduced leaves and flowers.

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

Halocnemum is a genus of halophytic shrubs in the family Amaranthaceae. The plants are fleshy and apparently articulated with characteristic globular or short-cylindrical lateral branches, and reduced leaves and flowers. There are two species, occurring from Southern Europe and North Africa to Asia.

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

Microcnemum is a genus in the plant family Amaranthaceae, containing a single species, Microcnemum coralloides. It is a dwarf annual halophyte with fleshy, apparently jointed stems and reduced leaves and flowers. The two subspecies show a disjunct distribution in Spain and Western Asia.

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

Patellifolia is a genus of flowering plants in the subfamily Betoideae of the family Amaranthaceae. These are mostly procumbent herbs occurring in the Western Mediterranean region and Macaronesia, with some isolated occurrences in North Africa and at the Horn of Africa. They are interesting as crop wild relatives of sugar beet.

Arthrocaulon is a genus of flowering plants belonging to the family Amaranthaceae.

<i>Salicornia pacifica</i> Species of plant

Salicornia pacifica, also known as pickleweed, sea asparagus, Pacific swampfire, or glasswort, is a species of low-growing perennial succulent halophyte in the genus Salicornia found in the Pacific coast of North America and California.

References

  1. 1 2 3 4 Ball, Peter W. (2004). "Sarcocornia." in Flora of North America: North of Mexico Volume 4: Magnoliophyta: Caryophyllidae, part 1 , Editorial Committee of the Flora of North America (Oxford University Press, 2004). ISBN   978-0-19-517389-5.
  2. Sarcocornia. PlantNET. National Herbarium of New South Wales, Royal Botanic Garden, Sydney.
  3. Steffen, S.; et al. (2010). "Revision of Sarcocornia (Chenopodiaceae) in South Africa, Namibia and Mozambique". Systematic Botany. 35 (2): 390–408. doi:10.1600/036364410791638379. S2CID   85950463.
  4. 1 2 3 4 Steffen, S; Ball, P.; Mucina, L.; Kadereit, G. (2015). "Phylogeny, biogeography and ecological diversification of Sarcocornia (Salicornioideae, Amaranthaceae)". Annals of Botany. 115 (3): 353–368. doi:10.1093/aob/mcu260. PMC   4332613 . PMID   25617410.
  5. Alonso, M. Á.; Crespo, M. B. (2008). "Taxonomic and nomenclatural notes on South American taxa of Sarcocornia (Chenopodiaceae)" (PDF). Annales Botanici Fennici. 45 (4): 241–254. doi:10.5735/085.045.0401. S2CID   86522475.
  6. Scott, A.J. (1978). "Reinstatement and revision of Salicorniaceae J. Agardh (Caryophyllales)". Botanical Journal of the Linnean Society. 75 (4): 366–367. doi:10.1111/j.1095-8339.1977.tb01493.x.
  7. "Sarcocornia". Tropicos . Missouri Botanical Garden . Retrieved 12 August 2016.
  8. Piirainen, Mikko; Liebisch, Oskar & Kadereit, Gudrun (2017). "Phylogeny, biogeography, systematics and taxonomy of Salicornioideae (Amaranthaceae/Chenopodiaceae) – A cosmopolitan, highly specialized hygrohalophyte lineage dating back to the Oligocene". Taxon. 66 (1): 109–132. doi:10.12705/661.6.
  9. "Search for Sarcocornia". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2022-04-09.