Cnidoscolus aconitifolius

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Cnidoscolus aconitifolius
Cnidoscolus chayamansa1 ies.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Euphorbiaceae
Genus: Cnidoscolus
Species:
C. aconitifolius
Binomial name
Cnidoscolus aconitifolius
Subspecies[1][2]

C. aconitifolius subsp. aconitifolius[1][2]
C. aconitifolius subsp. polyanthus [1][2]

Synonyms

Cnidoscolus chayamansa McVaugh[3]
Jatropha aconitifolia Mill.[4]

Cnidoscolus aconitifolius, commonly known as chaya, tree spinach, or spinach tree, is a large, fast-growing and leafy perennial shrub that is believed to have originated in the Yucatán Peninsula of Mexico.[3] The specific epithet, aconitifolius, means "Aconitum-like leaves". It has succulent stems that exude a milky sap when cut.

The plant can grow to be 6 metres (20 ft) tall, but usually is pruned to approximately 2 metres (6.6 ft) for easier leaf harvest. It is a popular leaf vegetable in Mexican and Central American cuisines, similar to spinach. White flowers are born on a terminal panicle held high above the foliage.

The leaves should be cooked before being eaten, as the raw leaves contain a high content of toxic hydrocyanic acid. Up to five raw leaves can be eaten a day. To be eaten safely, the required cooking time is 5–15 minutes,[5][6][7] with 20 minutes being recommended most often in recipes, and it should not be cooked in aluminium cookware.

Taxonomy[edit]

Cnidoscolus aconitifolius subsp. aconitifolius is found from northern Mexico to Guatemala and is cultivated as far south as Peru, while Cnidoscolus aconitifolius subsp. polyanthus (Pax and K.Hoffm.) Breckon is restricted to a small area in western Mexico.

Plants in the Chayamansa group (syn. Cnidoscolus chayamansa) are the most widely cultivated, because they lack stinging hairs on the leaves. It is divided into four cultivars, based on leaf morphology: 'Chayamansa' (most common), 'Estrella', 'Picuda', and 'Redonda'.[3]

Cultivation[edit]

Chaya is easy to grow and it suffers little insect damage. It may be a tender perennial in the United States, but persists in climates such as Florida. It is tolerant of heavy rain and has some drought tolerance. Propagation is normally by woody stem cuttings about 6-12 inches long, as seeds are produced only rarely. Early growth is slow as roots are slow to develop on the cuttings, so leaves are not harvested until the second year. Thereafter, Chaya leaves may be harvested continuously so long as no more than 50% of the leaves are removed from the plant, in order to guarantee healthy new plant growth.

A USDA study in Puerto Rico reported that higher yields of greens could be obtained with Chaya than any other vegetable they had studied. In another study Chaya leaves were found to contain substantially greater amounts of nutrients than spinach leaves.[6]

The numerous white flowers of the plants attract butterflies.

Consumption[edit]

Some varieties have stinging hairs and require gloves for harvesting. Cooking destroys the stinging hairs as well as toxins found in the raw plant. Chaya is one of the most productive green vegetables.[8][9]

Chaya leaf

Chaya is a good source of protein, vitamins, calcium, and iron; and is also a rich source of antioxidants,[10] however, raw Chaya leaves are toxic as they contain a glucoside that can release toxic cyanide. Cooking is essential prior to consumption to inactivate the toxic components. In this, Chaya is similar to cassava, which also contains toxic hydrocyanic glycosides and must be cooked before being eaten.[11] Cooking in aluminum utensils can result in a toxic broth, causing diarrhea,[12] so aluminium cookware should be avoided.

Young Chaya leaves and the thick, tender stem tips are cut and boiled as a spinach. It is a tasty vegetable and is exceptionally high in protein, calcium, iron, and vitamin A.[9] In fact, levels of Chaya leaf nutrients are two- to threefold greater than any other land-based leafy green vegetable.[13][12] Chaya leaves have a possible antidiabetic effect.[13]

Traditionally, leaves are immersed and simmered for 20 minutes and then served with oil or butter. Cooking for 20 minutes or more will render the leaves safe to eat. The stock or liquid in which the leaves are cooked may be safe for consumption also, as the cyanide is volatilized as hydrogen cyanide (HCN) during cooking.[12]

References[edit]

  1. ^ a b c "EOL Search: Cnidoscolus aconitifolius". Encyclopedia of Life. 4 June 2010. Retrieved 28 June 2010.
  2. ^ a b c "Search Results for: Cnidoscolus aconitifolius". Global Biodiversity Information Facility. Archived from the original on 22 September 2012. Retrieved 28 June 2010.
  3. ^ a b c G.J.H. Grubben; O.A. Denton, eds. (2004). Plant Resources of Tropical Africa. 2: Vegetables. PROTA Foundation. pp. 200–201. ISBN 978-90-5782-147-9.
  4. ^ "Cnidoscolus aconitifolius". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 31 May 2011.
  5. ^ Grubben, G. J. H. (2004). Vegetables. PROTA. p. 200. ISBN 9789057821479. chaya.
  6. ^ a b http://people.umass.edu/psoil370/Syllabus-files/Chaya.pdf
  7. ^ http://miraclesinaction.org/wp-content/uploads/2012/06/Chaya_broch_eng_r2.pdf
  8. ^ "Archived copy". Archived from the original on 7 March 2009. Retrieved 10 July 2009.CS1 maint: archived copy as title (link)
  9. ^ a b "The nutritive value of chaya, one of the most productive green vegetables". Ideas for growing food under difficult conditions - From Amaranth to Zai Holes - ECHO / ECHO development notes. Archived from the original on 6 July 2011.
  10. ^ Kuti, J. O.; Konuru, H. B. (2004). "Antioxidant Capacity and Phenolic Content in Leaf Extracts of Tree Spinach (Cnidoscolus spp.)". Journal of Agricultural and Food Chemistry. 52 (1): 117–21. doi:10.1021/jf030246y. PMID 14709023.
  11. ^ James M Stephens. "Chaya — Cnidoscolus chayamansa McVaugh". University of Florida IFAS Extension.
  12. ^ a b c "Chaya, the Maya miracle plant". Mexconnect. October 2009. Retrieved 31 May 2011.
  13. ^ a b Kuti, Joseph O.; Torres, Eliseo S. (1996). J. Janick (ed.). "Potential nutritional and health benefits of tree spinach". Progress in New Crops: 516–520.

External links[edit]