Portulaca oleracea

Portulaca oleracea (common purslane, also known as duckweed, little hogweed, or pursley)[1] is an annual succulent in the family Portulacaceae, which may reach 40 cm (16 in) in height. Approximately forty cultivars are currently grown.[2]

Portulaca oleracea
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Portulacaceae
Genus: Portulaca
Species:
P. oleracea
Binomial name
Portulaca oleracea

Its specific epithet oleracea means "vegetable/herbal" in Latin and is a form of holeraceus (oleraceus).[3][4]

Distribution

Purslane has an extensive distribution, assumed to be mostly anthropogenic,[5] 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.[6]

Description
Portulaca oleracea flower.

Purslane has smooth, reddish, mostly prostrate stems and the leaves, which may be alternate or opposite, are clustered at stem joints and ends.[7] 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[8] 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 compacted soils and drought.

Metabolism

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.[9]

History

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).[10] 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).[11]

In antiquity, its healing properties were thought so reliable that Pliny the Elder advised wearing the plant as an amulet to expel all evil (Natural History 20.210).[10]

Uses

Culinary
Greek salad with purslane
Purslane, raw
Nutritional value per 100 g (3.5 oz)
Energy84 kJ (20 kcal)
3.39 g
0.36 g
2.03 g
VitaminsQuantity %DV†
Vitamin A1320 IU
Thiamine (B1)
4%
0.047 mg
Riboflavin (B2)
9%
0.112 mg
Niacin (B3)
3%
0.48 mg
Vitamin B6
6%
0.073 mg
Folate (B9)
3%
12 μg
Vitamin C
25%
21 mg
Vitamin E
81%
12.2 mg
MineralsQuantity %DV†
Calcium
7%
65 mg
Iron
15%
1.99 mg
Magnesium
19%
68 mg
Manganese
14%
0.303 mg
Phosphorus
6%
44 mg
Potassium
11%
494 mg
Zinc
2%
0.17 mg
Other constituentsQuantity
Water92.86 g
Link to USDA Database entry
†Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

Purslane may be eaten as a leaf vegetable.[12] 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".[13] It has a slightly sour and salty taste and is eaten throughout much of Europe, the Middle East, Asia, and Mexico.[2][14] 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 at its highest when the plant is harvested in the early morning.[15]

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.[16] In Egypt, it is also cooked like spinach as a vegetable dish, but not in salads.

Companion plant

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.

Nutrition
P. sativa, a subspecies

Raw purslane is 93% water, 3% carbohydrates, and 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).

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.

See also

References
  1. "Portulaca oleracea". Integrated Taxonomic Information System. Retrieved 23 June 2020.
  2. Marlena Spieler (July 5, 2006). "Something Tasty? Just Look Down". The New York Times.
  3. Parker, Peter (2018). A Little Book of Latin for Gardeners. Little Brown Book Group. p. 328. ISBN 978-1-4087-0615-2. oleraceus, holeraceus = relating to vegetables or kitchen garden
  4. Whitney, William Dwight (1899). The Century Dictionary and Cyclopedia. Century Co. p. 2856. L. holeraceus, prop. oleraceus, herb-like, holus, prop. olus (oler-), herbs, vegetables
  5. "Portulaca oleracea (common purslane)". Go Botany. New England Wildflower Society.
  6. Byrne, R. & McAndrews, J.H. (1975). "Pre-Columbian puslane (Portulaca oleracea L.) in the New World" (PDF). Nature. 253 (5494): 726–727. Bibcode:1975Natur.253..726B. doi:10.1038/253726a0. Retrieved 29 July 2016.
  7. Hilty, John (2016). "Common Purslane (Portulaca oleracea". Illinois Wildflowers. Retrieved 2018-02-05.
  8. Kilpatrick, Judy. "Germinating Portulaca Seeds." Home Guides | SF Gate, http://homeguides.sfgate.com/germinating-portulaca-seeds-39371.html. Accessed 13 November 2019.
  9. Ferrari, Renata C.; Bittencourt, Priscila P.; Rodrigues, Maria A.; Moreno‐Villena, Jose J.; Alves, Frederico R. R.; Gastaldi, Vinícius D.; Boxall, Susanna F.; Dever, Louisa V.; Demarco, Diego; Andrade, Sónia C.S.; Edwards, Erika J.; Hartwell, James; Freschi, Luciano (2019). "C 4 and crassulacean acid metabolism within a single leaf: Deciphering key components behind a rare photosynthetic adaptation". New Phytologist. doi:10.1111/nph.16265.
  10. Megaloudi Fragiska (2005). "Wild and Cultivated Vegetables, Herbs and Spices in Greek Antiquity". Environmental Archaeology. 10 (1): 73–82. doi:10.1179/146141005790083858.
  11. Noted by John Dickie, Delizia! The Epic History of Italians and Their Food (New York, 2008), p. 37.
  12. Wright, Clifford A. (2012). "Purslane". Mediterranean Vegetables: A Cook's Compendium of All the Vegetables from the World's Healthiest Cuisine, with More Than 200 Recipes. Boston, Massachusetts: Harvard Common Press. pp. 276–277. ISBN 978-1-55832-775-7.
  13. Cobbett, William (1980). The English Gardener. Oxford: Oxford University Press. p. 126. ISBN 0192812920.
  14. Pests in Landscapes and Gardens: Common Purslane. Pest Notes University of California Agriculture and Natural Resources Publication 7461. October 2003
  15. Harold McGee. On Food and Cooking. Scribner. 2004 edition. ISBN 978-0684800011
  16. "Semizotlu Cacık – Hilal'in Mutfağı". Nefis Yemek Tarifleri (in Turkish). 2016-05-28. Retrieved 2017-08-07.
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