Betoideae | |
---|---|
Beta vulgaris subsp. maritima | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Caryophyllales |
Family: | Amaranthaceae |
Subfamily: | Betoideae Ulbr. |
Genera | |
about 6 genera, see text |
The Betoideae are a small subfamily of the flowering plant amaranth family, Amaranthaceae sensu lato (or in Chenopodiaceae sensu stricto). Commonly known members include beet, sugar beet, chard, and mangelwurzel, which all are cultivars of Beta vulgaris .
The species of Betoideae are annuals, biennial or perennial herbs, vines (Hablitzia) or subshrubs. The flowers have 5 tepals ( Aphanisma only 3) and 5 stamens (Aphanisma only one). The fruits of Betoideae are capsules that open with a circumscissile lid. [1]
In tribe Beteae, the perianth is basally indurated in fruit, and the stamens a basally inserted to a thickened bulge surrounding the visible part of the ovary. In tribe Hablitzieae, the tepals are not modified in fruit and membranous, and the stamens are basally united in a membranous ring. [1]
Most genera are distributed in Western and Southern Europe, in the Mediterranean and Southwest Asia, but one disjunct genus, Aphanisma , lives at the coasts of California. [1] [2]
The species of Betoideae are adapted to different ecological habitats, several growing in coastal habitats, some on rocks and in mountains, one in deciduous forests (Hablitzia). [3]
Oskar Eberhard Ulbrich described the subfamily Betoideae in 1934 within the plant family Chenopodiaceae. [4] He subdivided the taxon into two tribes, Hablitzieae and Beteae, the latter with only one genus, Beta . Phylogenetic research by Kadereit et al. (2006) confirmed this classification, whereas Romeira et al. (2016) suggest only one tribe. [1] [3]
The subfamily is now classified either in family Amaranthaceae sensu lato, [5] [6] or in Chenopodiaceae sensu stricto, (excluding the subfamily Polycnemoideae, as the other subfamilies of Chenopodiaceae, Betoideae, Camphorosmoideae, Chenopodioideae, Corispermoideae, Salicornioideae, Salsoloideae, and Suaedoideae, form a monophyletic group which is distinct from the Amaranthaceae s. str.). [7] Current taxonomic treatments and morphological, physiological and phylogenetic studies seem to prefer Chenopodiaceae s. str. for reasons of taxonomic stability. [7]
The subfamily comprises five genera with about 13-20 species. [1] [3]
The subfamily Betoideae is regarded as a monophyletic taxon, if Acroglochin is excluded. [1] [3] The age of the subfamily seems to be relatively old, originating during the Early Oligocene Glacial Maximum, [3] estimated 48.6-35.4 million years ago [2] They early diversified into genera about 32.5 million years ago. [3] The extant genera show narrow distributions in distant geographic regions, which may have resulted from speciation by isolation and following extinction events. [3] The areals of Aphanisma in California and Oreobliton in North-Africa are interpreted as remnants from a Beringian ancestor, the disjunction circa 15.4-9.2 million years ago. [2]
The differentiation between Beta and Patellifolia probably occurred early in the Late Oligocene. Both lineages tolerate aridity and highly saline soils, so they were able to survive dramatic aridity events in the past that led to the extinction of other more vulnerable lineages in the subfamily. [3]
Beet (Beta vulgaris) has an immense economic importance as sugar crop (sugar beet), and a great importance as a vegetable (chard, beetroot), and as fodder plant (mangelwurzel). This species is also used as medicinal plant, ornamental plant, dye and as renewable resource. It is the crop species with the highest economic value in the order Caryophyllales. Therefore, the other members of Betoideae, especially Beta and Patellifolia , are interesting as crop wild relatives. [3]
Beta vulgaris (beet) is a species of flowering plant in the subfamily Betoideae of the family Amaranthaceae. Economically, it is the most important crop of the large order Caryophyllales. It has several cultivar groups: the sugar beet, of greatest importance to produce table sugar; the root vegetable known as the beetroot or garden beet; the leaf vegetable known as chard or spinach beet or silverbeet; and mangelwurzel, which is a fodder crop. Three subspecies are typically recognised. All cultivars, despite their quite different morphologies, fall into the subspecies Beta vulgaris subsp. vulgaris. The wild ancestor of the cultivated beets is the sea beet.
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.
Sarcocornia is a formerly recognized genus of flowering plants in the amaranth family, Amaranthaceae. Species are known commonly as samphires, glassworts, or saltworts. 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, and is most diverse in the Cape Floristic Region of South Africa.
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
The Salsoloideae are a subfamily of the Amaranthaceae, formerly in family Chenopodiaceae.
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.
The Amaranthoideae are a subfamily of the Amaranthaceae. The stamens have anthers with two lobes (locules) and four pollen sacs. The main distribution of the subfamily is in tropical America, in tropical and Southern Africa, and in Australia.
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.
Salsola is a genus of the subfamily Salsoloideae in the family Amaranthaceae. The genus sensu stricto is distributed in central and southwestern Asia, North Africa, and the Mediterranean. A common name of various members of this genus and related genera is saltwort, for their salt tolerance. The genus name Salsola is from the Latin salsus, meaning "salty".
Bassia is a genus of flowering plants in the family Amaranthaceae. They are distributed in the western Mediterranean to eastern Asia. Some occur outside their native ranges as introduced species.
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.
The Polycnemoideae are a small subfamily of plants in the family Amaranthaceae, representing a basal evolutionary lineage. The few relictual species are distributed in Eurasia and North Africa, North America, and Australia.
The Suaedoideae are a subfamily of plants in the family Amaranthaceae.
Kali is a genus of plants in the subfamily Salsoloideae in the family Amaranthaceae. Common names of various members of this genus include buckbush, rolypoly, tumbleweed for its wind-blown seed dispersal habit, and Tartar thistle and Russian thistle for its origins.
Dysphania is a plant genus in the family Amaranthaceae, distributed worldwide from the tropics and subtropics to warm-temperate regions.
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.
Halimione is a plant genus from the subfamily Chenopodioideae of the family Amaranthaceae. It is a sister genus of Atriplex and is included in that genus by Plants of the World Online.
Acroglochin persicarioides is a species of flowering plants in the plant family Amaranthaceae. It is distributed from the Himalayas to China. The systematic position of the genus Acroglochin in subfamily Betoideae is still uncertain.
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.
Acroglochin is a genus of flowering plants in the family Amaranthaceae.