Portulaca oleracea (common purslane, also known as verdolaga, pigweed, little hogweed, red root, pursley) is an annual succulent in the family Portulacaceae, which may reach 40 centimetres (16 in) in height.
Approximately forty cultivars are currently grown.
It has an extensive distribution, assumed to be mostly anthropogenic, throughout the Old World extending from North Africa and Southern Europe through the Middle East and the Indian Subcontinent to Malesia and Australasia. The species status in the New World is uncertain: in general, it is considered an exotic weed, however, there is evidence that the species was in Crawford Lake deposits (Ontario) in 1350-1539, suggesting that it reached North America in the pre-Columbian era. Scientists suggested that the plant was already eaten by native Americans, who spread its seeds. How it reached the New World is currently unknown. It is naturalised elsewhere, and in some regions is considered an introduced weed.
It has smooth, reddish, mostly prostrate stems and alternate leaves clustered at stem joints and ends. The yellow flowers have five regular parts and are up to 6 millimetres (0.24 in) wide. Depending upon rainfall, the flowers appear at any time during the year. The flowers open singly at the center of the leaf cluster for only a few hours on sunny mornings. Seeds are formed in a tiny pod, which opens when the seeds are mature. Purslane has a taproot with fibrous secondary roots and is able to tolerate poor compacted soils and drought.
Widely used in East Mediterranean countries, archaeobotanical finds are common at many prehistoric sites. In historic contexts, seeds have been retrieved from a protogeometric layer in Kastanas, as well as from the Samian Heraion dating to seventh century BC. In the fourth century BC, Theophrastus names purslane, andrákhne (ἀνδράχνη), as one of the several summer pot herbs that must be sown in April (H.P 7.1.2). As Portulaca it figures in the long list of comestibles enjoyed by the Milanese given by Bonvesin de la Riva in his "Marvels of Milan" (1288).
A common plant in parts of India, purslane is known as sanhti, punarva, paruppu keerai, "gangabayala kura", or kulfa.
|Nutritional value per 100 g (3.5 oz)|
|Energy||84 kJ (20 kcal)|
|Vitamin A||1320 IU|
|Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database
Although purslane is considered a weed in the United States, it may be eaten as a leaf vegetable. It has a slightly sour and salty taste and is eaten throughout much of Europe, the Middle East, Asia, and Mexico. The stems, leaves and flower buds are all edible. Purslane may be used fresh as a salad, stir-fried, or cooked as spinach is, and because of its mucilaginous quality it also is suitable for soups and stews. The sour taste is due to oxalic and malic acid, the latter of which is produced through the crassulacean acid metabolism (CAM) pathway that is seen in many xerophytes (plants living in dry conditions), and is maximal when the plant is harvested in the early morning.
Australian Aborigines use the seeds of purslane to make seedcakes. Greeks, who call it andrakla (αντράκλα) or glystrida (γλυστρίδα), use the leaves and the stems with feta cheese, tomato, onion, garlic, oregano, and olive oil. They add it in salads, boil it, or add it to casseroled chicken. In Turkey, besides being used in salads and in baked pastries, it is cooked as a vegetable similar to spinach. Called Bakleh in Lebanon, is eaten raw in a famous salad called fattoush, and cooked as a garniture in fatayeh (triangular salted pastries). In Albania, known as burdullak, it also is used as a vegetable similar to spinach, mostly simmered and served in olive oil dressing, or mixed with other ingredients as a filling for dough layers of byrek. In the south of Portugal (Alentejo), baldroegas are used as a soup ingredient. In Pakistan, it is known as qulfa and is cooked as in stews along with lentils, similarly to spinach, or in a mixed green stew.
||This section needs more medical references for verification or relies too heavily on primary sources. (May 2015)|
Known as Ma Chi Xian (pinyin: translates as "horse tooth amaranth") in traditional Chinese medicine. Its leaves are used for insect or snake bites on the skin, boils, sores, pain from bee stings, bacillary dysentery, diarrhea, hemorrhoids, postpartum bleeding, and intestinal bleeding.
As a companion plant, purslane provides ground cover to create a humid microclimate for nearby plants, stabilising ground moisture. Its deep roots bring up moisture and nutrients that those plants can use, and some, including corn, will follow purslane roots down through harder soil that they cannot penetrate on their own (ecological facilitation). It is known as a beneficial weed in places that do not already grow it as a crop in its own right.
Purslane contains more omega-3 fatty acids (alpha-linolenic acid in particular) than any other leafy vegetable plant. Studies have found that purslane has 0.01 mg/g of eicosapentaenoic acid (EPA). It also contains vitamins (mainly vitamin A, vitamin C, vitamin E (alpha-tocopherol), vitamin B, carotenoids), and dietary minerals such as magnesium, calcium, potassium, and iron.
Also present are two types of betalain alkaloid pigments, the reddish betacyanins (visible in the coloration of the stems) and the yellow betaxanthins (noticeable in the flowers and in the slight yellowish cast of the leaves). Both of these pigment types are potent antioxidants and have been found to have antimutagenic properties in laboratory studies.
Cooked vs. raw
100 grams of fresh purslane leaves contain 300 to 400 mg of alpha-linolenic acid. One cup (250 ml) of cooked leaves contains 90 mg of calcium, 561 mg of potassium, and more than 2,000 IUs of vitamin A.
Morning harvest vs. afternoon
When stressed by low availability of water, purslane, which has evolved in hot and dry environments, switches to photosynthesis using crassulacean acid metabolism (the CAM pathway):[clarification needed] At night its leaves trap carbon dioxide, which is converted into malic acid (the souring principle of apples), and, in the day, the malic acid is converted into glucose. When harvested in the early morning, the leaves have ten times the malic acid content as when harvested in the late afternoon, and thus have a significantly more tangy taste.
Betacyanins isolated from Portulaca oleracea improved cognition deficits in aged mice. A subclass of homoisoflavonoids from the plant showed in vitro cytotoxic activities towards four human cancer cell lines.
In popular culture
- Purslane also finds mention in a translation of the Bible as a repulsive food. Job's question in Job 6:6 is translated in the Revised Standard Version as, "Can that which is tasteless be eaten without salt or is there any taste in the slime of the purslane?". That is thought[by whom?] to be a mistranslation of mallow, however.
- The name verdolaga, associated with the plant that grows in South America, is a nickname for football clubs with green-white schemes in their uniforms, such as Colombia's Atletico Nacional and Argentina's Ferrocarril Oeste.
- Marlena Spieler (July 5, 2006). "Something Tasty? Just Look Down". The New York Times.
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- Noted by John Dickie, Delizia! The Epic History of Italians and Their Food (New York, 2008), p. 37.
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- Pests in Landscapes and Gardens: Common Purslane. Pest Notes University of California Agriculture and Natural Resources Publication 7461. October 2003
- Harold McGee. On Food and Cooking. Scribner. 2004 edition. ISBN 978-0684800011
- Bensky, Dan, et al. Chinese Herbal Medicine, Materia Medica. China: Eastland Press Inc., 2004.
- Tierra, C.A., N.D., Michael (1988). Planetary Herbology. Lotus Press. p. 199.
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- Omara-Alwala, Thomas R.; Mebrahtu, Tadesse; Prior, Debra E.; Ezekwe, Michael O. (March 1991). "Omega-three fatty acids in purslane (Portulaca oleracea) Tissues". Journal of the American Oil Chemists’ Society. 68 (3): 198–199. doi:10.1007/BF02657769.
- Simopoulos, A P; Norman, H A; Gillaspy, J E; Duke, J A (August 1992). "Common purslane: a source of omega-3 fatty acids and antioxidants.". Journal of the American College of Nutrition. 11 (4): 374–382. doi:10.1080/07315724.1992.10718240. PMID 1354675.
- "Evaluation of the Antimutagenic Activity of Different Vegetable Extracts Using an In Vitro Screening Test" (PDF). westernpharmsoc.org.
- "Oxalate content of raw and cooked purslane". world-food.net.
- Wang, CQ. Yang GQ. (2010). "Betacyanins from Portulaca oleracea L. ameliorate cognition deficits and attenuate oxidative damage induced by D-galactose in the brains of senescent mice". Phytomedicine. 17 (7): 527–32. doi:10.1016/j.phymed.2009.09.006.
- Yan, J; Sun, LR; Zhou, ZY; Chen, YC; Zhang, WM; Dai, HF; Tan, JW (Aug 2012). "Homoisoflavonoids from the medicinal plant Portulaca oleracea". Phytochemistry. 80: 37–41. doi:10.1016/j.phytochem.2012.05.014.
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