Beta vulgaris

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Beta vulgaris
Koeh-167.jpg
Beta vulgaris subsp. vulgaris
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Amaranthaceae
Genus: Beta
Species:
B. vulgaris
Binomial name
Beta vulgaris
L.
Synonyms [1]
List
    • Beta albaDC.
    • Beta altissimaSteud.
    • Beta atriplicifoliaRouy
    • Beta bengalensisRoxb.
    • Beta brasiliensisScheidw.
    • Beta carnulosaGren.
    • Beta cicla(L.) L.
    • Beta cicla var. argenteaKrassochkin & Burenin
    • Beta cicla var. viridisKrassochkin & Burenin
    • Beta crispaTratt.
    • Beta decumbensMoench
    • Beta esculentaSalisb.
    • Beta hortensisMill.
    • Beta hybridaAndrz.
    • Beta incarnataSteud.
    • Beta luteaSteud.
    • Beta marinaCrantz
    • Beta maritimaL.
    • Beta maritima subsp. atriplicifolia(Rouy) Burenin
    • Beta maritima subsp. marcosii(O.Bolòs & Vigo) Juan & M.B.Crespo
    • Beta maritima subsp. orientalis(Roth) Burenin
    • Beta noeanaBunge ex Boiss.
    • Beta orientalisRoth
    • Beta purpureaSteud.
    • Beta rapaDumort.
    • Beta rapaceaHegetschw.
    • Beta roseaSteud.
    • Beta sativaBernh.
    • Beta strictaK.Koch
    • Beta sulcataGasp.
    • Beta trifloraSalisb.
    • Beta vulgaris var. aurantiaBurenin
    • Beta vulgaris var. coniciformisBurenin
    • Beta vulgaris var. marcosiiO.Bolòs & Vigo
    • Beta vulgaris var. maritima(L.) Moq.
    • Beta vulgaris var. mediasiaticaBurenin
    • Beta vulgaris var. ovaliformisBurenin
    • Beta vulgaris var. rapaceaW.D.J.Koch
    • Beta vulgaris var. rubidusBurenin
    • Beta vulgaris var. rubrifoliaKrassochkin ex Burenin
    • Beta vulgaris var. virescensBurenin
    • Beta vulgaris var. viridifoliaKrassochkin ex Burenin

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. [2] 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 (Beta vulgaris subsp. maritima).

Contents

Description

Flowers of Beta vulgaris Suikerbiet bloem Beta vulgaris.jpg
Flowers of Beta vulgaris

Beta vulgaris is a herbaceous biennial or, rarely, perennial plant up to 120 cm (rarely 200 cm) height; cultivated forms are mostly biennial. The roots of cultivated forms are dark red, white, or yellow and moderately to strongly swollen and fleshy (subsp. vulgaris); they are brown, fibrous, sometimes swollen, and woody in the wild subspecies. The stems grow erect or, in the wild forms, often procumbent; they are simple or branched in the upper part, [3] and their surface is ribbed and striate. [4] The basal leaves have a long petiole (which may be thickened and red, white, or yellow in some cultivars). The simple leaf blade is oblanceolate to heart-shaped, dark green to dark red, slightly fleshy, usually with a prominent midrib, with entire or undulate margin, 5–20 cm long on wild plants (often much larger in cultivated plants). The upper leaves are smaller, their blades are rhombic to narrowly lanceolate. [3]

The flowers are produced in dense spike-like, basally interrupted inflorescences. Very small flowers sit in one- to three- (rarely eight-) flowered glomerules in the axils of short bracts or in the upper half of the inflorescence without bracts. [3] The hermaphrodite flowers are urn-shaped, green or tinged reddish, and consist of five basally connate perianth segments (tepals), 3-5 × 2–3 mm, 5 stamens, and a semi-inferior ovary with 2-3 stigmas. [3] The perianths of neighbouring flowers are often fused. [5] Flowers are wind-pollinated or insect-pollinated, the former method being more important. [6]

In fruit, the glomerules of flowers form connate hard clusters. The fruit (utricle) is enclosed by the leathery and incurved perianth, and is immersed in the swollen, hardened perianth base. [3] The horizontal seed is lenticular, 2–3 mm, with a red-brown, shiny seed coat. The seed contains an annular embryo and copious perisperm (feeding tissue). [4]

There are 18 chromosomes found in 2 sets, which makes beets diploid. Using chromosome number notation, 2n = 18. [3] [7]

Stereo image
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Right frame 
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Parallel view ( Stereogram guide parallel.png )
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Cross-eye view ( Stereogram guide cross-eyed.png )
Beetseeds3d.jpg
Beetseeds3d.jpg
Beet seeds

Distribution and habitat

The wild forms of Beta vulgaris are distributed in southwestern, northern and Southeast Europe along the Atlantic coasts and the Mediterranean Sea, in North Africa, Macaronesia, to Western Asia. [2] [8] Naturalized they occur in other continents. [9] The plants grow at coastal cliffs, on stony and sandy beaches, in salt marshes or coastal grasslands, and in ruderal or disturbed places. [2]

Cultivated beets are grown worldwide in regions without severe frosts. They prefer relatively cool temperatures between 15 and 19 °C. Leaf beets can thrive in warmer temperatures than beetroot. As descendants of coastal plants, they tolerate salty soils and drought. They grow best on pH-neutral to slightly alkaline soils containing plant nutrients and additionally sodium and boron. [9]

Taxonomy

The species description of Beta vulgaris was made in 1753 by Carl Linnaeus in Species Plantarum , at the same time creating the genus Beta. [10] Linnaeus regarded sea beet, chard and red beet as varieties (at that time, sugar beet and mangelwurzel had not been selected yet). In the second edition of "Species Plantarum" (1762), Linnaeus separated the sea beet as its own species, Beta maritima, and left only the cultivated beets in Beta vulgaris. [11] Today sea beet and cultivated beets are considered as belonging to the same species, because they may hybridize and form fertile offspring. The taxonomy of the various cultivated races has a long and complicated history, they were treated at the rank of either subspecies, or convarieties or varieties. Now rankless cultivar groups are used, according to the International Code of Nomenclature for Cultivated Plants.

Beta vulgaris belongs to the subfamily Betoideae in family Amaranthaceae (s.l, including the Chenopodiaceae). [2] [8]

Sea beet (Beta vulgaris subsp maritima) at the shores of Heligoland Beta vulgaris subsp maritima 89-08.JPG
Sea beet (Beta vulgaris subsp maritima) at the shores of Heligoland
Flowering sugar beet Suikerbiet bloeiwijze Beta vulgaris.jpg
Flowering sugar beet

Beta vulgaris is classified into three subspecies: [12]

Yellow-stemmed chard (with purple-leaved kale). Chard3.jpg
Yellow-stemmed chard (with purple-leaved kale).

Ecology

Beets are a food plant for the larvae of a number of Lepidoptera species.

Uses

Food

Packaged, precooked beetroot Biarava confezionata.jpg
Packaged, precooked beetroot
Beets, raw
Nutritional value per 100 g (3.5 oz)
Energy 180 kJ (43 kcal)
9.56 g
Sugars 6.76 g
Dietary fiber 2.8 g
Fat
0.17 g
1.61 g
Vitamins Quantity
%DV
Vitamin A equiv.
0%
2 μg
0%
20 μg
Thiamine (B1)
3%
0.031 mg
Riboflavin (B2)
3%
0.04 mg
Niacin (B3)
2%
0.334 mg
Pantothenic acid (B5)
3%
0.155 mg
Vitamin B6
5%
0.067 mg
Folate (B9)
27%
109 μg
Vitamin C
6%
4.9 mg
Minerals Quantity
%DV
Calcium
2%
16 mg
Iron
6%
0.8 mg
Magnesium
6%
23 mg
Manganese
16%
0.329 mg
Phosphorus
6%
40 mg
Potassium
7%
325 mg
Sodium
5%
78 mg
Zinc
4%
0.35 mg
Other constituentsQuantity
Water87.58g

Percentages are roughly approximated using US recommendations for adults.
Source: USDA FoodData Central

Spinach beet leaves are eaten as a pot herb. Young leaves of the garden beet are sometimes used similarly. The midribs of Swiss chard are eaten boiled while the whole leaf blades are eaten as spinach beet.

In some parts of Africa, the whole leaf blades are usually prepared with the midribs as one dish. [15]

The leaves and stems of young plants are steamed briefly and eaten as a vegetable; older leaves and stems are stir-fried and have a flavour resembling taro leaves.

The usually deep-red roots of garden beet can be baked, boiled, or steamed, and often served hot as a cooked vegetable or cold as a salad vegetable. They are also pickled. Raw beets are added to salads. A large proportion of the commercial production is processed into boiled and sterilised beets or into pickles. In Eastern Europe beet soup, such as cold borsch, is a popular dish. Yellow-coloured garden beets are grown on a very small scale for home consumption. [15]

The consumption of beets causes pink urine in some people.

Jews traditionally eat beet on Rosh Hashana (New Year). Its Aramaic name סלקא sounds like the word for "remove" or "depart"; it is eaten with a prayer "that our enemies be removed". [16]

Nutrition

In a 100 gram amount, beets supply 43 Calories, contain 88% water, 10% carbohydrates, about 2% protein and have a minute amount of fat (table). The only micronutrients of significant content are folate (27% of the Daily Value, DV) and manganese (16% DV).

Traditional medicine

The roots and leaves of the beet have been used in traditional medicine to treat a wide variety of ailments. [15] Ancient Romans used beetroot as a treatment for fevers and constipation, amongst other ailments. Apicius in De re coquinaria gives five recipes for soups to be given as a laxative, three of which feature the root of beet. [17] Platina recommended taking beetroot with garlic to nullify the effects of 'garlic-breath'. [18] [ clarification needed ]

Beet greens and Swiss chard are both considered high oxalate foods which are implicated in the formation of kidney stones. [19]

Phytochemicals and research

Betaine and betalain, two phytochemical compounds prevalent in Beta vulgaris, are under basic research for their potential biological properties. [20]

Other uses

Cultivars with large, brightly coloured leaves are grown for decorative purposes. [15]

Cultivation

A bundle of Beta vulgaris, known as beetroot Beets-Bundle.jpg
A bundle of Beta vulgaris, known as beetroot

Beets are cultivated for fodder (e.g. mangelwurzel), for sugar (the sugar beet), as a leaf vegetable (chard or "Bull's Blood"), or as a root vegetable ("beetroot", "table beet", or "garden beet").

"Blood Turnip" was once a common name for beet root cultivars for the garden. Examples include: Bastian's Blood Turnip, Dewing's Early Blood Turnip, Edmand Blood Turnip, and Will's Improved Blood Turnip. [21]

The "earthy" taste of some beetroot cultivars comes from the presence of geosmin. Researchers have not yet answered whether beets produce geosmin themselves or whether it is produced by symbiotic soil microbes living in the plant. [22] Breeding programs can produce cultivars with low geosmin levels yielding flavours more acceptable to consumers. [23]

Beets are one of the most boron-intensive of modern crops, a dependency possibly introduced as an evolutionary response its pre-industrial ancestor's constant exposure to sea spray; on commercial farms, a 60 tonne per hectare (26.8 ton/acre) harvest requires 600 grams of elemental boron per hectare (8.6 ounces/acre) for growth. [24] A lack of boron causes the meristem and the shoot to languish, eventually leading to heart rot. [24]

Red or purple coloring

A selection of different colored beetroots. Uncommon beetroot colours.jpg
A selection of different colored beetroots.

The color of red/purple beetroot is due to a variety of betalain pigments, unlike most other red plants, such as red cabbage, which contain anthocyanin pigments. The composition of different betalain pigments can vary, resulting in strains of beetroot which are yellow or other colors in addition to the familiar deep red. [25] Some of the betalains in beets are betanin, isobetanin, probetanin, and neobetanin (the red to violet ones are known collectively as betacyanin ). Other pigments contained in beet are indicaxanthin and vulgaxanthins (yellow to orange pigments known as betaxanthins). Indicaxanthin has been shown as a powerful protective antioxidant for thalassemia and prevents the breakdown of alpha-tocopherol (Vitamin E).[ citation needed ]

Betacyanin in beetroot may cause red urine in people who are unable to break it down. This is called beeturia. [26]

The pigments are contained in cell vacuoles. Beetroot cells are quite unstable and will 'leak' when cut, heated, or when in contact with air or sunlight. This is why red beetroots leave a purple stain. Leaving the skin on when cooking, however, will maintain the integrity of the cells and therefore minimize leakage.

History

Sea beet (Beta vulgaris subsp. maritima), the wild ancestor of the cultivated forms. Beta vulgaris maritima 001.JPG
Sea beet (Beta vulgaris subsp. maritima), the wild ancestor of the cultivated forms.

The sea beet, the ancestor of modern cultivated beets, prospered along the coast of the Mediterranean Sea. Beetroot remains have been excavated in the Third dynasty Saqqara pyramid at Thebes, Egypt, and four charred beetroots were found in the Neolithic site of Aartswoud in the Netherlands though it has not been determined whether these were domesticated or wild forms of B. vulgaris. Zohary and Hopf note that beetroot is "linguistically well identified". They state the earliest written mention of the beet comes from 8th century BC Mesopotamia. [27] The Greek Peripatetic Theophrastus later describes the beet as similar to the radish, while Aristotle also mentions the plant. [27] [28] Available evidence, such as that provided by Aristotle and Theophrastus, suggests the leafy varieties of the beet were grown primarily for most of its history, though these lost much of their popularity following the introduction of spinach. The ancient Romans considered beets an important health food and an aphrodisiac. [29]

Roman and Jewish literary sources suggest that in the 1st century BC the domestic beet was represented in the Mediterranean basin primarily by leafy forms like chard and spinach beet. [27] Zohary and Hopf also argue that it is very probable that beetroot cultivars were also grown at the time, and some Roman recipes support this. [27] [28] Later English and German sources show that beetroots were commonly cultivated in Medieval Europe. [28]

The sugar beet

Modern sugar beets date back to mid-18th century Silesia where the king of Prussia subsidised experiments aimed at processes for sugar extraction. [28] [30] In 1747 Andreas Marggraf isolated sugar from beetroots and found them at concentrations of 1.3-1.6%. [14] He also demonstrated that sugar could be extracted from beets that was the same as that produced from sugarcane. [30] His student, Franz Karl Achard, evaluated 23 varieties of mangelwurzel for sugar content and selected a local race from Halberstadt in modern-day Saxony-Anhalt, Germany. Moritz Baron von Koppy and his son further selected from this race for white, conical tubers. [14] The selection was named 'Weiße Schlesische Zuckerrübe', meaning white Silesian sugar beet, and boasted about a 6% sugar content. [14] [28] This selection is the progenitor of all modern sugar beets. [14]

Sugar beets Sugar beets.jpg
Sugar beets

A royal decree led to the first factory devoted to sugar extraction from beetroots being opened in Kunern, Silesia (now Konary, Poland) in 1801. The Silesian sugar beet was soon introduced to France where Napoleon opened schools specifically for studying the plant. He also ordered that 28,000 hectares (69,000 acres) be devoted to growing the new sugar beet. [28] This was in response to British blockades of cane sugar during the Napoleonic Wars, which ultimately stimulated the rapid growth of a European sugar beet industry. [28] [30] By 1840 about 5% of the world's sugar was derived from sugar beets, and by 1880 this number had risen more than tenfold to over 50%. [28] The sugar beet was introduced to North America after 1830 with the first commercial production starting in 1879 at a farm in Alvarado, California. [14] [30] The sugar beet was also introduced to Chile via German settlers around 1850. [14]

It remains a widely cultivated commercial crop for producing table sugar, in part due to subsidies scaled to keep it competitive with tropical sugar cane.

Related Research Articles

<span class="mw-page-title-main">Sugar beet</span> Plant grown commercially for sugar production

A sugar beet is a plant whose root contains a high concentration of sucrose and which is grown commercially for sugar production. In plant breeding, it is known as the Altissima cultivar group of the common beet. Together with other beet cultivars, such as beetroot and chard, it belongs to the subspecies Beta vulgaris subsp. vulgaris. Its closest wild relative is the sea beet.

<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.

<span class="mw-page-title-main">Mangelwurzel</span> Cultivated root vegetable

Mangelwurzel or mangold wurzel, also called mangold, mangel beet, field beet, fodder beet and (archaic) root of scarcity, is a cultivated root vegetable. It is a variety of Beta vulgaris, the same species that also contains the red beet (beetroot) and sugar beet varieties. The cultivar group is named Crassa Group. Their large white, yellow or orange-yellow swollen roots were developed in the 18th century as a fodder crop for feeding livestock.

<span class="mw-page-title-main">Parsnip</span> Root vegetable in the flowering plant family Apiaceae

The parsnip is a root vegetable closely related to carrot and parsley, all belonging to the flowering plant family Apiaceae. It is a biennial plant usually grown as an annual. Its long taproot has cream-colored skin and flesh, and, left in the ground to mature, becomes sweeter in flavor after winter frosts. In its first growing season, the plant has a rosette of pinnate, mid-green leaves. If unharvested, it produces a flowering stem topped by an umbel of small yellow flowers in its second growing season, later producing pale brown, flat, winged seeds. By this time, the stem has become woody, and the tap root inedible. Precautions should be taken when handling the stems and foliage, as parsnip sap can cause a skin rash or even blindness if exposed to sunlight after handling.

<span class="mw-page-title-main">Beetroot</span> Taproot portion of the beet plant

The beetroot is the taproot portion of a beet plant, usually known in North America as beets while the vegetable is referred to as beetroot in British English, and also known as the table beet, garden beet, red beet, dinner beet or golden beet.

<span class="mw-page-title-main">Chard</span> Green leafy vegetable

Chard or Swiss chard is a green leafy vegetable. In the cultivars of the Flavescens Group, the leaf stalks are large and often prepared separately from the leaf blade; the Cicla Group is the leafy spinach beet. The leaf blade can be green or reddish; the leaf stalks are usually white, yellow or red.

<i>Ullucus</i> Species of plant

Ullucus is a genus of flowering plants in the family Basellaceae, with one species, Ullucus tuberosus, a plant grown primarily as a root vegetable, secondarily as a leaf vegetable. The name ulluco is derived from the Quechua word ulluku, but depending on the region, it has many different names. These include illaco, melloco, chungua or ruba, olluco or papalisa, or ulluma.

<span class="mw-page-title-main">Leaf vegetable</span> Plant leaves eaten as a vegetable

Leaf vegetables, also called leafy greens, pot herbs, vegetable greens, or simply greens, are plant leaves eaten as a vegetable, sometimes accompanied by tender petioles and shoots. Leaf vegetables eaten raw in a salad can be called salad greens.

<span class="mw-page-title-main">Sea beet</span>

The sea beet, Beta vulgaris subsp. maritima, is a member of the family Amaranthaceae, previously of the Chenopodiaceae. Carl Linnaeus first described Beta vulgaris in 1753; in the second edition of Species Plantarum in 1762, he divided the species into wild and cultivated varieties, giving the name Beta maritima to the wild taxon. The sea beet is native to the coasts of Europe, northern Africa, and southern Asia.

<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>Cnidoscolus aconitifolius</i> Species of tree

Cnidoscolus aconitifolius, commonly known as chaya, tree spinach, or spinach tree, is a large, fast-growing and leafy perennial shrub that is believed to have originated in the Yucatán Peninsula of Mexico. The specific epithet, aconitifolius, means "Aconitum-like leaves". It has succulent stems that exude a milky sap when cut.

<span class="mw-page-title-main">Carrot</span> Root vegetable, usually orange in color

The carrot is a root vegetable, typically orange in color, though heirloom variants including purple, black, red, white, and yellow cultivars exist, all of which are domesticated forms of the wild carrot, Daucus carota, native to Europe and Southwestern Asia. The plant probably originated in Persia and was originally cultivated for its leaves and seeds. The most commonly eaten part of the plant is the taproot, although the stems and leaves are also eaten. The domestic carrot has been selectively bred for its enlarged, more palatable, less woody-textured taproot.

<i>Cercospora beticola</i> Species of fungus

Cercospora beticola is a fungal plant pathogen which typically infects plants of the genus Beta, within the family of Chenopodiaceae. It is the cause of Cercospora leaf spot disease in sugar beets, spinach and swiss chard. Of these hosts, Cercospora leaf spot is the most economically impactful in sugar beets. Cercospora beticola is a deuteromycete fungus that reproduces using conidia. There is no teleomorph stage. C. beticola is a necrotrophic fungus that uses phytotoxins specifically Cercospora beticola toxin (CBT) to kill infected plants. CBT causes the leaf spot symptom and prevents root formation. Yield losses from Cercospora leaf spot are around 20 percent.

<span class="mw-page-title-main">Peronospora farinosa</span> Species of single-celled organism

Peronospora farinosa is a species name that has been widely applied to downy mildew on leaves of wild and cultivated Amaranthaceae: Amaranthus, Atriplex, Bassia, Beta, Chenopodium, Halimione, Salsola, Spinacia, etc. However, the species name has been taxonomically rejected as the original description contained reference to multiple species and could not unequivocally be attributed to a species of Peronospora. In the past, some of the species on important crop plants have been given names as formae speciales, notably f.sp. betae on sugar beet and f.sp. spinaciae on spinach. However, phylogentic reconstructions have revealed that these "forms" of Peronospora on different genera and their subdivisions, are distinct species, most of which already have previously published scientific names. Such host specialization possibly also exists with respect to the various wild amaranthaceous species given as hosts of P. farinosa.

Uromyces betae is a fungal species and plant pathogen infecting beet.

<i>Beet necrotic yellow vein virus</i> Species of virus

Beet necrotic yellow vein virus (BNYVV) is a plant virus, transmitted by the plasmodiophorid Polymyxa betae. The BNYVV is a member of the genus Benyvirus and is responsible for rhizomania, a disease of sugar beet that causes proliferation of thin rootlets, and leads to a smaller tap root with reduced sugar content. Infected plants are less able to take up water, and wilting can be observed during the warm period of the year. If the infection spreads to the whole plant, vein yellowing, necrosis and yellow spots appear on the leaves, giving the virus its name.

<span class="mw-page-title-main">Betalain</span> Class of chemical compounds

Betalains are a class of red and yellow tyrosine-derived pigments found in plants of the order Caryophyllales, where they replace anthocyanin pigments. Betalains also occur in some higher order fungi. They are most often noticeable in the petals of flowers, but may color the fruits, leaves, stems, and roots of plants that contain them. They include pigments such as those found in beets.

<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.

Beet is a plant, the taproot portion of which is eaten as a vegetable, called beets or beetroot.

<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.

References

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  15. 1 2 3 4 Grubben, G.J.H. & Denton, O.A. (2004) Plant Resources of Tropical Africa 2. Vegetables. PROTA Foundation, Wageningen; Backhuys, Leiden; CTA, Wageningen.
  16. Keritot 6a; Horiyot 12a; Rabbenu Nissim at the end of Rosh Hashana, citing the custom of Rav Hai Gaon; Abudraham; Shulchan Aruch OC 583:1
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