Portulaca oleracea (common purslane, also known as little hogweed, or pursley) is an annual (actually tropical perennial in USDA growing zones 10–11) succulent in the family Portulacaceae, which may reach 40 cm (16 in) in height. Approximately forty cultivars are currently grown.
There are likely thousands of names for the purslane plant in various languages from the many human cultures that have eaten the plant as a nutritious herb throughout history.
Purslane has an extensive distribution, assumed to be mostly anthropogenic (or hemerochoric), extending from North Africa and Southern Europe through the Middle East and the Indian subcontinent to Malesia and Australasia. The species status in the Americas is uncertain. In general, it is often considered an exotic weed, but 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 Americas is currently unknown.
Purslane has smooth, reddish, mostly prostrate stems and the leaves, which may be alternate or opposite, are clustered at stem joints and ends. The yellow flowers have five regular parts and are up to 6 mm (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. The tiny seeds are formed in a pod, which opens when the seeds are mature. Purslane has a taproot with fibrous secondary roots and is able to tolerate poor soil and drought.
The fruits are many-seeded capsules. Seed set is considerable; one plant can develop up to 193,000 seeds. The seeds germinate optimally at a temperature above 25 °C; they are light germinators, with even a soil cover of 5 mm having a negative effect on germination.
The first publication of Portulaca oleracea was in 1753 by Carl von Linné in Species Plantarum. Due to the great variability, a large number of subspecies and varieties have been described as species of their own, but according to other publications, they all fall within the range of variation of Portulaca oleracea. The synonyms Portulaca oleracea subsp. sativa, Portulaca sativa, and Portulaca oleracea var. sativa, which are more common in the literature, refer to a somewhat more robust form in cultivation with larger seeds that cannot be separated from the species.
P. oleracea is one of very few plants able to utilize both CAM and C4 photosynthesis pathways, for a long time believed to be incompatible with each other despite biochemical similarities. P. oleracea will switch from C4 to CAM pathways during times of drought and there is transcription regulation and physiological evidence for C4-CAM hybrid photosynthesis during mild drought.
Pests and diseasesEdit
Compared to other common crops, P. oleracea is more tolerant of pests due to its waxy cover which protects the plant from insects and diseases. In some instances P. oleracea is even known to have antifungal properties. However some phytotoxic metabolites of Drechslera indica can cause necrosis on purslane. Dichotomophthora portulacae can cause stem rot.
Schizocerella pilicornis and Hypurus bertrandi are known to feed on Portulaca oleracea. In some instances they may help control the competitiveness of Portulaca oleracea to prevent weed infestation in fields where Portulaca oleracea is not wanted, however they do not stop it from growing completely.
Purslane is 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 (Enquiry into Plants 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).
|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 FoodData Central
Purslane may be eaten as a leaf vegetable. William Cobbett noted that it was "eaten by Frenchmen and pigs when they can get nothing else. Both use it in salad, that is to say, raw". It has a slightly sour and salty taste and is eaten throughout much of Europe, North Africa, the Middle East, Asia, and Mexico. The stems, leaves and flower buds are all edible raw or cooked. 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 at its highest when the plant is harvested in the early morning.
Aboriginal Australians use the seeds of purslane to make seedcakes. Greeks, who call it andrákla (αντράκλα) or glistrída (γλιστρίδα), 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, or is mixed with yogurt to form a tzatziki variant. In Egypt, it is also cooked like spinach as a vegetable dish, but not in salads. In Kurdistan, people commonly make a kind of soup from it called palpina soup (شۆربای پەڵپینە). In the Alentejo region of Portugal, purslane is used to cook a traditional soup (sopa de beldroegas) which is topped with soaked bread, poached eggs and/or goats' cheese.
Soil salination on agricultural soils can cause a decrease in crop yields, and it is no longer possible to grow salt-sensitive species on that soil. Purslane has a high tolerance for salt toxicity, which makes it suitable for cropping in areas where irrigation is necessarily carried out with water having a high chloride-based salinity.
Purslane can remove salt from the cultivation medium under saline conditions. As an intercrop or during one growing season, it can remove 210 kg/ha of chloride and 65 kg/ha of sodium when cultivated at 6.5 dS *m−1, allowing growth of salt-sensitive plants on saline soils. Purslane has a positive effect of companion plants in salty conditions, such as tomatoes.
Raw purslane is 93% water, 3% carbohydrates, 2% protein, and contains negligible fat (table). In a 100 gram reference amount, purslane supplies 20 calories, and rich amounts (20% or more of the Daily Value, DV) of vitamin E (81% DV) and vitamin C (25% DV), with moderate content (11-19% DV) of several dietary minerals (table). Purslane is a rich source of alpha-linolenic acid, an essential omega-3 fatty acid.
In popular cultureEdit
Verdolaga, the Spanish word for purslane, is a nickname for South American football clubs with green-white schemes in their uniforms, including Colombia's Atletico Nacional and Argentina's Ferrocarril Oeste.
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