Phaseolus vulgaris
A staple legume domesticated in the Americas and grown globally.
Phaseolus vulgaris, the common bean, is a herbaceous annual plant in the legume family Fabaceae. It is a major food crop cultivated worldwide, with a long history of domestication in the Americas and a central role in indigenous agriculture as part of the "Three Sisters" system alongside squash and maize. The plant forms a green-leaved vine that produces beans inside pods. All wild members of the species have a climbing habit, but cultivated varieties are classified as either bush beans, which grow as erect bushes, or pole beans, which form long vines. The leaves are alternate, green or purple, and divided into three oval, smooth-edged leaflets. Flowers are white, pink, or purple, about a centimeter long, and self-pollinating, which aids in developing stable cultivars. Pods can be green, yellow, black, or purple, each containing four to eight smooth, kidney-shaped beans that vary widely in color and are often mottled. The beans can remain viable for up to five years. The species has a small genome with eleven chromosomal pairs. Raw or undercooked beans contain the toxic compound phytohaemagglutinin, which can be deactivated by boiling for thirty minutes. The unripe green pods are also eaten as a vegetable, and the leaf is occasionally used as food, with the straw used as fodder. Common beans were domesticated separately in Mesoamerica and the southern Andes region thousands of years ago, resulting in two distinct gene pools. They arrived in Europe through the Columbian exchange and are now grown on every continent except Antarctica. In 2022, global production of dry common beans reached 28 million tonnes, with India leading at 23 percent of the total.
- classification
- Species in genus Phaseolus, family Fabaceae
- native_range
- Americas
- chromosome_count
- 11 pairs (2n = 22)
- 2022_production
- 28 million tonnes dry beans worldwide
- top_producer
- India (23% of total)
Lore & Background
Wild members of the species have a climbing habit, but cultivated varieties include both bush beans (20–60 cm tall) and pole beans (vines 2–3 m long). The plant bears alternate, trifoliate leaves and self-pollinating white, pink, or purple flowers, which produce pods 8–20 cm long containing 4–8 kidney-shaped beans of varied colors. In the Americas, the common bean was one of the three Mesoamerican crops—along with squash and maize—that formed the "Three Sisters" agricultural system. After the Columbian exchange, it spread to Europe and is now grown on every continent except Antarctica. Raw dry beans contain the toxic lectin phytohaemagglutinin, which can be deactivated by boiling for 30 minutes. The unripe green pods are also used as food, and the leaves are occasionally eaten as a vegetable. The straw serves as fodder.
Reader's Guide
Phaseolus vulgaris is one of the world's most important food legumes, providing protein, carbohydrates, and essential nutrients. The species' adaptability, with bush and climbing varieties, allows it to be grown in diverse environments, from smallholder plots to large-scale irrigated farms. The beans are a dietary staple in many regions, and their nutritional profile—rich in folate, manganese, and other minerals—makes them valuable for food security. However, proper preparation is essential to avoid toxicity from phytohaemagglutinin, which is especially concentrated in red kidney beans. Its legacy endures as a versatile, nutritious crop that sustains millions of people and embodies centuries of agricultural innovation.
Did You Know?
- All wild members of Phaseolus vulgaris have a climbing habit, but cultivated varieties include both bush and pole types.
- The toxic compound phytohaemagglutinin in raw beans can be deactivated by boiling for 30 minutes.
Frequently Asked Questions
What is Phaseolus vulgaris?
Phaseolus vulgaris is the common bean, a herbaceous annual legume in the family Fabaceae. It is one of the most widely cultivated food crops on the planet.
Where and when was the common bean first domesticated?
The common bean was first domesticated in Mesoamerica and the southern Andes roughly 8,000 years ago. Its native range spans the Americas, though it is now grown across the globe.
What is the 'Three Sisters' connection for Phaseolus vulgaris?
In indigenous American agriculture, the common bean was planted together with squash and maize as part of a complementary system known as the Three Sisters. This polyculture let the three crops support each other's growth and nutrition.
More in Common Plants And Crops 1-24
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