Phaseolus vulgaris

"Pole bean" redirects here. For other uses, see Beanpole.

Phaseolus vulgaris, the common bean,^[3] is a herbaceous annual plant grown worldwide for its edible dry seeds or green, unripe pods. Its leaf is also occasionally used as a vegetable and the straw as fodder. Its botanical classification, along with other Phaseolus species, is as a member of the legume family, Fabaceae. Like most members of this family, common beans acquire the nitrogen they require through an association with rhizobia, which are nitrogen-fixing bacteria.

Phaseolus vulgaris
A flat-podded variety of the common bean
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Genus:	Phaseolus
Species:	P. vulgaris
Binomial name
Phaseolus vulgaris L.
Synonyms[2]
Phaseolus aborigineus Burkart Phaseolus communis Pritz. Phaseolus compressus DC. Phaseolus esculentus Salisb. Phaseolus nanus L.

The common bean has a long history of cultivation. All wild members of the species have a climbing habit,^[4][5] but many cultivars are classified either as bush beans or climbing beans, depending on their style of growth. The other major types of commercially grown beans are the runner bean (Phaseolus coccineus) and the broad bean (Vicia faba).

Beans are grown on every continent except Antarctica. In 2022, 28 million tonnes of dry common beans were produced worldwide, led by India with 23% of the total.^[6]

Raw dry beans contain the toxic compound phytohaemagglutinin,^[7] which can be inactivated by cooking beans for ten minutes at boiling point (100 °C, 212 °F). The U.S. Food and Drug Administration also recommends an initial soak of at least 5 hours in water which should then be discarded.^[7]

Description

Bush varieties form erect bushes 20–60 centimetres (8–20 inches) tall, while pole or running varieties form vines 2–3 metres (7–10 feet) long. All varieties bear alternate, green or purple leaves, which are divided into three oval, smooth-edged leaflets, each 6–15 cm (2–6 in) long and 3–11 cm (1–4 in) wide. The white, pink, or purple flowers are about 1 cm long and have 10 stamens. The flowers are self-pollinating, which facilitates the selection of stable cultivars. The flowers give way to pods 8–20 cm (3–8 in) long and 1–1.5 cm wide. These may be green, yellow, black, or purple, each containing 4–8 beans. Some varieties develop a string along the pod; these are generally cultivated for dry beans, as green stringy beans are not commercially desirable. The beans are smooth, plump, kidney-shaped, up to 1.5 cm long, range widely in color and are often mottled in two or more colors. The beans maintain their germination capacity for up to 5 years.

Like most species from Phaseolus, the genome of P. vulgaris has 11 chromosomal pairs (2n = 22). Its genome is one of the smallest in the legume family at 625 Mbp per haploid genome.^[8]

Raw or undercooked beans contain a toxic protein called phytohaemagglutinin.^[7]: 254

• 
  Beans germinating
• 
  Beans sprouting
• 
  Bean tendrils, exhibiting anti-clockwise wrapping
• 
  Bean flower close-up
• 
  Bean cultivars illustrated in 1891 catalog of French seed producer Vilmorin

Taxonomy

The common bean, like all species of Phaseolus is a member of the legume family Fabaceae.

In Species Plantarum in 1753, Carl Linnaeus classified the beans known by him into genus Phaseolus and genus Dolichos, naming 11 species of Phaseolus,^[9] including 6 cultivated species and 5 "wild" species.

The beans cultivated in Europe prior to the Columbian Exchange were of Asian origin and are unrelated to New World Phaseolus species. The Eurasian species were transferred to other genera including Vigna, Vicia and Lablab, so members of the Phaseolus genus are now all from the Americas.^[10]

Etymology

Ancient Greeks used the word φάσηλος (phasēlos) to refer to the beans of Asian origins that were cultivated in Europe at the time.^[11] The Romans used both the Latinized phaseolus and their own faba to refer to different pre-Columbian species of beans,^[12] presumably using the word faseolus for smaller seeds like those belonging to the genus Vigna such as the black-eyed peas^[13] and the word faba for larger seeds, such as the fava beans. This latter word, faba, was related to the Proto-Germanic bauno, from which the Old English word bean is derived and has the meaning of "bean, pea, legume".^[14] When Phaseolus vulgaris arrived in Europe in the 16th century, this species was yet another seed in a pod, thus there were already words in the European languages describing it.

In the Americas, P. vulgaris is also known as ayacotl in nahuatl (Aztec language), búul in Mayan (Maya language) and purutu in Quechua (Inca language). In Argentina, Bolivia, Chile, Paraguay and Uruguay, the Spanish name 'poroto' is used, being derived from its corresponding Quechua word. Additional names include the Castilian Spanish frijol, the Portuguese feijão, and the Catalan fesol.

Distribution

Two genetic pools of the domestication of P. vulgaris
1 – Mesoamerican area
2 – Andean area

Wild P. vulgaris is native to the Americas. It was originally believed that it had been domesticated separately in Mesoamerica and in the southern Andes region some 8,000 years ago, giving the domesticated bean two gene pools.^[15][16] However, recent genetic analyses show that it was domesticated in Mexico first, then split into the Mesoamerican and Andean P. vulgaris gene pools.^[17]

Beans, squash and maize (corn) are the three Mesoamerican crops that constitute the "Three Sisters", central to indigenous American agriculture.^[18]

The common bean arrived in Europe as part of the Columbian exchange.^[19]

Cultivation

Good commercial yield in favorable environments under irrigation is 6 to 8 ton/ha fresh and 1.5 to 2 ton/ha dry seed.^[20]

Cultivars and varieties

Archeologists found large-seeded varieties of the domesticated bean in the highlands of Peru, dating to 2300 BC, and spreading to the coastal regions by around 500 BC.^[21] Small-seeded varieties were found in sites in Mexico, dating to 300 BC, which then spread north and east of the Mississippi River by 1000 AD.^[21]

Many well-known bean cultivars and varieties belong to this species, and the list below is in no way exhaustive. Both bush and running (pole) cultivars/varieties exist. The colors and shapes of pods and seeds vary over a wide range.^[22]

Name	Image	Description
Anasazi		Anasazi beans are a dappled red and white bean first cultivated by Ancestral Puebloan people around 130 CE in what is now the Four Corners region of the United States. Anasazi Bean is often confused with Jacob's Cattle variety, but Anasazi has splashes of color, whereas Jacob's Cattle has splashes and small spots. Anasazi beans were adopted by commercial growers beginning in the 1980s and marketed under the name "Anasazi"; traditionally they were known by the Spanish names frijol conejo (rabbit bean), vaquita (little cow), or pájaro carpintero (woodpecker).[23][24]
Appaloosa		Front portion of the bean is ivory colored; the other end is speckled with reddish-purple and mocha. The bean is named after the Appaloosa ponies of the Nez Perce tribe. The seed was cultivated near the Palouse River in Eastern Washington and Northern Idaho.
Black turtle		The black turtle bean has small, shiny black seeds. It is especially popular in Latin American cuisine.
Bolita bean		Bolita beans are a traditional variety utilized in New Mexican cuisine by New Mexican Hispanos from northern New Mexico and southern Colorado. They can range from whitish-tan to beige and even pinkish-purple in color.
Calypso		Calypso beans, also called Panda beans or Yin Yang beans, are half black and half white, with one or two black dots in the white area. When young, the pods can be harvested as green beans. But when full-grown, they are used as a bean for drying.
Cranberry		The cranberry beans originated in Colombia as the cargamanto bean. Borlotti or Roman beans are a variety of cranberry beans bred in Italy to have a thicker skin. They are much used in Mediterranean cuisine. A widespread cultivar of European borlotti is 'Borlotto Lingua di Fuoco' (Tongue of Fire).
Dragon tongue		Dragon tongue bean is a type of cranberry bean. It is a flavorful, juicy bean whose seeds are encased in a buffed, colorful pod with mottled burgundy patterns throughout the shell's surface. The shelled beans are pale pistachio green in color, their size, petite, and their shape, ovate and slightly curved.[25]
Flageolet		Flageolet beans are picked before full maturity and dried in the shade to retain a green color and a distinct taste. The seeds are small, light green, and kidney-shaped. If shelled and cooked when fresh but semi-dry, the texture is firm yet creamy. They are often eaten in France, where they traditionally accompany lamb.
Kidney		Kidney beans, also known as red beans, are named for their visual resemblance in shape and color to kidneys. They are sometimes used in chili con carne and are an integral part of the cuisine in northern regions of India. They are also used in New Orleans and much of southern Louisiana for the Monday Creole dish of red beans and rice as well as the Caribbean habichuelas guisadas and Central American gallo pinto.
Jacob's Cattle		Similar to Anasazi in appearance, with the exception of having also dots. Legend says the Passamaquoddy indigenous people of Maine gave these beans as a gift to Joseph Clark, the first Caucasian child born in Lubec, Maine in the 1600s. Also known as Trout.[26]
Mocha with Cherry		"Mocha with Cherry" is a polebean. This variety is said to come from the Rodope area in Bulgaria, and to be related to "Papa de Rola" and "Dove's Breast".
North Holland Brown		This bean is an old Dutch Heirloom bush variety primarily used for dried beans.
Pea, Painted Pony		A type of P. vulgaris called pea bean has been recorded in Britain since the 16th century.[27] In the US, the name "pea bean" is also used to describe small white beans and the same name is used for Vigna unguiculata subsp. sesquipedalis, also called yard-long bean and cowpea.[28] The seeds of the British pea bean are bicolored red-brown and white (not to be confused with Jacob's Cattle, which is darker red than reddish-brown). The plants are typical climbing beans. The beans are either eaten in the pod-like French beans or may be harvested when mature and eaten as other dried beans.[29]
Peruano		Also known as mayocoba, canary, canario, Peruvian, Mexican yellow bean. A light green to jaundice yellow kidney-shaped bean that is preferred in certain regions of Mexico (such as Jalisco[30]) for making frijoles refritos, and in Peru for making tacu tacu, a pan-fried cake of leftover beans and rice.[31] Often described as having a "buttery" and "creamy" texture.
Pink		Pink beans are small, pale pink, oval-shaped beans also known by the Spanish name habichuelas rosadas.[32] The Santa Maria pinquito (Spanglish = pink and small), is commercially grown on the mesas above Santa Maria, California, and is a necessary ingredient in Santa Maria-style barbecue.
Pinto		Pinto beans are named for their mottled skin (Spanish: pinto = painted or mottled). They are the most common bean in the United States[33] and northwestern Mexico,[34] and are most often eaten whole in broth or mashed and refried. Either whole or mashed, they are a common filling for burritos. The young pods may also be harvested and cooked as green pinto beans.
Polish Eagle Beans		Also called by the Independence bean by the Polish people because the brown pattern on the inner side of the bean resembles and Eagle - the Polish emblem. This bean variety was cultivated in the XIX century as an act of patriotism by the Polish people.[35]
Rattlesnake		A medium-sized, oblong bean with light brown seeds striped with brown markings. Named for the snake-like manner in which their pods coil around the vine.[36]
Sulphur		aka China Yellow Bean: A thin-skinned, nearly round Maine heirloom bean that has a tawny yellow color but cooks white and has a distinctly unique flavor.[37] This is a choice variety for use in the traditional Bean Hole style.[38]
Tiger's Eye		A bush variety, thought to have originated in Chile or Argentina.[39]
White		Navy beans or haricot beans are particularly popular in the United Kingdom and the United States. Other white beans include cannellini, a popular variety in central and southern Italy that is related to the kidney bean. White beans are the most abundant plant-based source of phosphatidylserine known.[40]
Yellow (Enola type)		'Sinaloa Azufrado,' 'Mayocoba,' and 'Peruano' (also called canary) are yellow beans. Peruano beans (see above) are small, oval, yellow beans about 1/2 in (1 cm) long with a thin skin. They have a creamy texture when cooked. Despite the name ('Peruvian beans' in Spanish), they are native to Mexico. Yellow beans are uncommon in the United States due to a controversial patent issued in 1999 to John Proctor, who selected and named a strain of yellow beans from seeds he brought back from Mexico. U.S. Patent No. 5,894,079 (the Enola or yellow bean patent) granted POD-NERS, LLC., exclusive right to import and sell yellow beans in the United States from 1999 through 2008 when the patent was rejected after reexamination.[41][42]
Yellow Eye		aka Maine Yellow Eye, this is the most popular baking bean in Maine, which comes in several strains, including the 'Steuben,' one of the oldest heirloom beans. It has a wide appeal for its clean, mild taste and is considered the baked bean of choice for church and grange suppers.[37]

Dry bean production – 2022^[6]

Country	Millions of tonnes
India	6.6
Brazil	2.8
Myanmar	2.7
China	1.3
United States	1.2
Mexico	1.0
World	28.3
Source: FAOSTAT of the United Nations[6]

Production

In 2022, world production of dry common beans was 28 million tonnes, led by India with 23% of the total. Brazil and Myanmar were secondary producers.

Toxicity

Further information: Phytohaemagglutinin

The toxic compound phytohaemagglutinin, a lectin, is present in many common bean varieties but is especially concentrated in red kidney beans. White kidney beans contain about a third as many toxins as the red variety; broad beans (Vicia faba) contain 5 to 10% as much as red kidney beans.^[7]

Phytohaemagglutinin can be inactivated by cooking beans for ten minutes at boiling point (100 °C, 212 °F). Insufficient cooking, such as in a slow cooker at 80 °C/ 176 °F, is insufficient to deactivate all toxins. To safely cook the beans, the U.S. Food and Drug Administration recommends boiling for 30 minutes to ensure they reach a sufficient temperature for long enough to destroy the toxin completely.^[43] For dry beans, the FDA also recommends an initial soak of at least 5 hours in water which should then be discarded.^[7] Outbreaks of poisoning have been associated with cooking kidney beans in slow cookers.^[7]

The primary symptoms of phytohaemagglutinin poisoning are nausea, vomiting, and diarrhea. Onset is from one to three hours after consumption of improperly prepared beans, and symptoms typically resolve within a few hours.^[7] Consumption of as few as four or five raw, soaked kidney beans can cause symptoms.^[7] Canned red kidney beans are safe to use immediately, as they have already been cooked.^[44][45][46]

Beans are high in purines, which are metabolized to uric acid. Uric acid is not a toxin but may promote the development or exacerbation of gout. However, more recent research has questioned this association, finding that moderate intake of purine-rich foods is not associated with an increased risk of gout.^[47]

Beans, snap, green, raw

Nutritional value per 100 g (3.5 oz)
Energy	152 kJ (36 kcal)
Carbohydrates	6.97 g
Sugars	3.26 g
Dietary fiber	2.7 g
Fat	0.22 g
Protein	1.3 g
Vitamins and minerals Vitamins Quantity %DV† Vitamin A equiv. beta-Carotene lutein zeaxanthin 4% 35 μg 4% 379 μg 640 μg Thiamine (B1) 7% 0.082 mg Riboflavin (B2) 8% 0.104 mg Niacin (B3) 5% 0.734 mg Pantothenic acid (B5) 5% 0.225 mg Vitamin B6 8% 0.141 mg Folate (B9) 8% 33 μg Vitamin C 14% 12.2 mg Vitamin E 3% 0.41 mg Vitamin K 36% 43 μg Minerals Quantity %DV† Calcium 3% 37 mg Copper 8% 0.069 mg Iron 6% 1.03 mg Magnesium 6% 25 mg Manganese 9% 0.216 mg Phosphorus 3% 38 mg Potassium 7% 211 mg Selenium 1% 0.6 μg Sodium 0% 6 mg Zinc 2% 0.24 mg
Other constituents	Quantity
Water	90.3 g
Link to USDA Database entry
†Percentages estimated using US recommendations for adults,[48] except for potassium, which is estimated based on expert recommendation from the National Academies.[49]

Uses

Nutrition

Beans, white, mature seeds, cooked, boiled, without salt

Nutritional value per 100 g (3.5 oz)
Energy	581 kJ (139 kcal)
Carbohydrates	25.1 g
Sugars	0.34 g
Dietary fiber	6.3 g
Fat	0.35 g
Protein	9.73 g
Vitamins and minerals Vitamins Quantity %DV† Thiamine (B1) 10% 0.118 mg Riboflavin (B2) 4% 0.046 mg Niacin (B3) 1% 0.14 mg Pantothenic acid (B5) 5% 0.229 mg Vitamin B6 5% 0.093 mg Folate (B9) 20% 81 μg Vitamin C 0% 0 mg Vitamin E 6% 0.94 mg Vitamin K 3% 3.5 μg Minerals Quantity %DV† Calcium 7% 90 mg Copper 32% 0.287 mg Iron 21% 3.7 mg Magnesium 15% 63 mg Manganese 28% 0.636 mg Phosphorus 9% 113 mg Potassium 19% 561 mg Selenium 2% 1.3 μg Sodium 0% 6 mg Zinc 13% 1.38 mg
Other constituents	Quantity
Water	63.1 g
Link to USDA Database entry
†Percentages estimated using US recommendations for adults,[48] except for potassium, which is estimated based on expert recommendation from the National Academies.[49]

Raw green beans are 90% water, 7% carbohydrates, 1% protein, and contain negligible fat. In a reference amount of 100 grams (3.5 oz), raw green beans supply 36 calories, and are a rich source (20% or more of the Daily Value, DV) of vitamin K (41% DV) and a moderate source (10-19% DV) of vitamin C, vitamin B6, and manganese.

Dry white common beans, after boiling, are 63% water, 25% carbohydrates, 10% protein, and contain little fat. In a reference amount of 100 grams (3.5 oz), boiled white common beans supply 139 calories and are a rich source of folate and manganese, with moderate amounts of thiamine and several dietary minerals.

Dry beans

Dry beans will keep indefinitely if stored in a cool, dry place, but as time passes, their nutritive value and flavor degrade, and cooking times lengthen. Dried beans are almost always cooked by boiling, often after being soaked in water for several hours. While the soaking is not strictly necessary, it shortens cooking time and results in more evenly textured beans. In addition, soaking beans removes 5 to 10% of the gas-producing sugars that can cause flatulence for some people.^[50] The methods include simple overnight soaking and the power soak method, in which beans are boiled for three minutes and then set aside for 2–4 hours. Before cooking, the soaking water is drained off and discarded. Dry common beans take longer to cook than most pulses: cooking times vary from one to four hours but are substantially reduced with pressure cooking.

In Mexico, Central America, and South America, the traditional spice used with beans is epazote, which is also said to aid digestion. In East Asia, a type of seaweed, kombu, is added to beans as they cook for the same purpose. Salt, sugar, and acidic foods such as tomatoes may harden uncooked beans, resulting in seasoned beans at the expense of slightly longer cooking times.^{[citation needed]}

Dry beans may also be bought cooked and canned as refried beans, or whole with water, salt, and sometimes sugar.

Green beans and wax beans

Main article: Green bean

The three commonly known types of green beans are string or snap beans, which may be round or have a flat pod; stringless or French beans, which lack a tough, fibrous string running along the length of the pod; and runner beans, which belong to a separate species, Phaseolus coccineus. Green beans may have a purple rather than green pod, which changes to green when cooked.^[51] Wax beans are P. vulgaris beans that have a yellow^[4] or white pod. Wax bean cultivars are commonly grown;^[4] the plants are often of the bush or dwarf form.^[4]

As the name implies, snap beans break easily when the pod is bent, giving off a distinct audible snap sound. The pods of snap beans (green, yellow, and purple) are harvested when they are rapidly growing, fleshy, tender (not tough and stringy), and bright in color, and the seeds are small and underdeveloped (8 to 10 days after flowering).

Green beans and wax beans are often steamed, boiled, stir-fried, or baked in casseroles.

Shelling beans

Shell, shelled, or shelling beans are beans removed from their pods before being cooked or dried. Common beans can be used as shell beans, but the term also refers to other species of beans whose pods are not typically eaten, such as lima beans, soybeans, peas, and fava beans. Fresh shell beans are nutritionally similar to dry beans but are prepared more like vegetables, often steamed, fried, or made into soups.^{[citation needed]}

Popping beans

The nuña is an Andean subspecies, P. v. subsp. nunas (formerly P. vulgaris Nuñas group), with round, multicolored seeds that resemble pigeon eggs. When cooked on high heat, the bean explodes, exposing the inner part in the manner of popcorn and other puffed grains.

Other uses

Bean leaves have been used to trap bedbugs in houses.^[52] Microscopic hairs (trichomes) on the bean leaves entrap the insects.^[52]

Beans have been used as devices in various methods of divination since ancient times. Fortune-telling using beans is called favomancy.

P. vulgaris has been found to bio-accumulate zinc, manganese, and iron and have some tolerance to their respective toxicities, suggesting suitability for natural bio-remediation of heavy-metal-contaminated soils.^{[53][non-primary source needed]}

In culture

In 1528, Pope Clemente VII received some white beans, which thrived. Five years later, he gave a bag of beans as a present to his niece, Catherine, on her wedding to Prince Henri of France, along with the county of the Lauragais, whose county town is Castelnaudary, now synonymous with the white bean dish of cassoulet.^[19]

Gallery

• 
  Chili con carne
• 
  Succotash
• 
  Cassoulet
• 
  Beans with smoked pork, a traditional Romanian dish

See also

• Adzuki bean
• Chickpea
• Dal
• Lentil
• List of dried foods
• List of diseases of the common bean
• Mung bean
• Organic beans
• Vicia faba, or broad bean

References

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4. Phillips, R.; Rix, M. (1993). Vegetables. New York: Random House. ISBN 978-0-679-75024-6.^{[page needed]}
5. Raja, Vicente; Silva, Paula L.; Holghoomi, Roghaieh; Calvo, Paco (2020-11-10). "The dynamics of plant nutation". Scientific Reports. 10 (1): 19465. Bibcode:2020NatSR..1019465R. doi:10.1038/s41598-020-76588-z. ISSN 2045-2322. PMC 7655864. PMID 33173160.
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7. "Bad Bug Book: Handbook of Foodborne Pathogenic Microorganisms and Natural Toxins: Phytohaemagglutinin" (PDF). United States Food and Drug Administration. Archived (PDF) from the original on 2013-04-18. Retrieved 2020-04-17.
8. Gepts, P. (2001). Encyclopedia of Genetics. Elsevier. pp. 1444–1445. doi:10.1006/rwgn.2001.1749. ISBN 978-0-12-227080-2.
9. Linnaei, Caroli (1753). Species plantarum : exhibentes plantas rite cognitas... (thanks to biodiversitylibrary.org) (in Latin). pp. 723–725. Retrieved 2023-11-18.
10. Chauvet, M. (1982). "Le point sur la nomenclature des haricots, à l'occasion de la parution de la monographie de Maréchal, Mascherpa et Stainie". Journal d'agriculture traditionnelle et de botanique appliquée (in French). 29 (1): 31–39. doi:10.3406/jatba.1982.3857.
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13. Sturtevant, E. L (1887). "History of Garden Vegetables". The American Naturalist. 21 (4): 321–333. Bibcode:1887ANat...21..321S. doi:10.1086/274456. Retrieved 2 December 2023. p.328: He [Albertus Magnus] also says, " Et sunt faseoli multorum colorum, sed quodlibet granorum habet maculam nigramin loco cotyledonis."
14. Harper, D. (n.d.). "Etymology of bean". Online Etymology Dictionary. Retrieved 2 December 2023.
15. Paul Gepts (December 1998). "Origin and evolution of common bean: past events and recent trends". HortScience. 33 (7): 1124–1130. doi:10.21273/HORTSCI.33.7.1124.
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18. Hill, Christina Gish (2020-11-20). "Returning the 'three sisters' – corn, beans, and squash – to Native American farms nourishes people, land and cultures". The Conversation. Retrieved 2021-01-08.
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21. Pearman, Georgina (2005). Prance, Ghillean; Nesbitt, Mark (eds.). The Cultural History of Plants. Routledge. pp. 143–144. ISBN 0-415-92746-3.
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25. "Dragon Tongue Shelling Beans". Specialty Produce. Retrieved 17 November 2023.
26. "Jacob's Cattle Bean". Slow Food USA.org. 2 April 2020. Retrieved 17 April 2023. Slow Food USA tends the Ark of Taste catalog, a repository of critically important but increasinglycritically important but increasingly endangered food sources.
27. "The Herball or Generall Historie of Plantes (1597)". mpg.de. p. 1040. The party coloured kidney bean of Egypt Phaseolus aegypticus
28. "Vigna unguiculata subsp. sesquipedalis". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved September 22, 2013.
29. – The National Vegetable Society – the Pea bean Archived January 25, 2007, at the Wayback Machine
30. Sando, Steve; Barrington, Vanessa (2008). Heirloom Beans (1 ed.). San Francisco, CA: Chronicle Books. p. 17. ISBN 978-0-8118-6069-7.
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External links

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