Erythroxylum coca

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Malpighiales

Familia: Erythroxylaceae
Genus: Erythroxylum
Species: Erythroxylum coca
Varietas: E. c. var. ipadu
Name

Erythroxylum coca Lam. Encycl. 2: 393. 1786.
Synonyms

Erythroxylum bolivianum Burck
Erythroxylum chilpei E.Machado Cazoria
Erythroxylum peruvianum Mitchel. & Pascal. ex Steud.

Erythroxylum coca, Walther Otto Mueller

Distribution
Native distribution areas:

Continental: Southern America
Regional: Western South America
Peru, Bolivia (Beni, Cochabamba, La Paz, Pando, Santa Cruz), Colombia (Amazonas, Antioquia, Arauca, Boyac, Caquet, Casanare, Cesar, Crdoba, Cundinamarca, Guaina, Guaviare, Huila, Magdalena, Meta, Nario, Norte de Santander, Putumayo, Santander, Tolima, Vaups, Vichada), Ecuador

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
References
Primary references

Lamarck, J.-B. 1786–1788. Encyclopédie méthodique. Botanique. Tome 2. 774 pp. Panckoucke, Paris; Plomteux, Liége. BHL Reference page.

Links

Hassler, M. 2020. Erythroxylum coca. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2020. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2020 February 4. Reference page.
USDA, ARS, Germplasm Resources Information Network. Erythroxylum coca in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.
Tropicos.org 2020. Erythroxylum coca. Missouri Botanical Garden. Published online. Accessed: 4 February 2020.
Tropicos.org: Peru Checklist: Erythroxylum coca. Missouri Botanical Garden. Published online. Accessed: February 2020.
Tropicos.org: Catalogue of the Vascular Plants of Ecuador: Erythroxylum coca. Missouri Botanical Garden. Published online. Accessed: February 2020.

Vernacular names
Aymar aru: Khoka
беларуская: Какаінавы куст
English: Coca
español: Coca
eesti: Kokapõõsas, Koka-punapuu, Koka
suomi: Kokapensas, aitokokapensas
македонски: Кока
português: Coca
Runa Simi: Kuka
Türkçe: Koka

Erythroxylum coca is one of two species of cultivated coca.

Description

The coca plant resembles a blackthorn bush, and grows to a height of 2–3 m (7–10 ft). The branches are straight, and the leaves, which have a green tint, are thin, opaque, oval, and taper at the extremities. A marked characteristic of the leaf is an areolated portion bounded by two longitudinal curved lines, one line on each side of the midrib, and more conspicuous on the underside of the leaf.

The flowers are small, and disposed in little clusters on short stalks; the corolla is composed of five yellowish-white petals, the anthers are heart-shaped, and the pistil consists of three carpels united to form a three-chambered ovary. The flowers mature into red berries.

Unlike Erythroxylum novogranatense, Erythroxylum coca requires very acidic soil conditions. Soil acidity and water acidity need to be below pH 5.5, with the optimal value being pH 3.5, similar to that of Rhododendron potting soils. At pH 6.5 and above, chlorosis and leaf distortion occur.[1]

The leaves are sometimes eaten by the larvae of the moth Eloria noyesi.

Of the two cultivated species of coca, Erythroxylum coca has greater resistance to the use of glyphosate as an herbicide than Erythroxylum novogranatense.[2]
Taxonomy
Further information: Coca § Species and evolution

Among the genus Erythroxylum, cocaine-rich leaves are obtained from four taxa:

Erythroxylum coca var. coca
Erythroxylum coca var. ipadu
Erythroxylum novogranatense var. novogranatense
Erythroxylum novogranatense var. truxillense

Amazonian coca

Erythroxylum coca var. ipadu, also known as Amazonian coca, is closely related to Erythroxylum coca var. coca, from which it originated relatively recently.[3] E. coca var. ipadu does not escape cultivation or survive as a feral or wild plant like E. coca var. coca [4] It has been suggested that due to a lack of genetic isolation to differentiate it from E. coca var. coca, E. coca var. ipadu may be better defined as a distinct cultivar than a taxonomic variety.[5]

Unlike the other species of coca which are propagated through seeds, E. coca var. ipadu, which rarely produce seeds, is propagated through stem cuttings which remain viable for several weeks if kept moist.[4] Since Amazonian coca is vegetatively propagated, entire plantations may be populated from the same clone. E. coca var. ipadu is specially adapted to the shifting agriculture of semi-nomadic Amazonian peoples. Since cuttings of E. coca var. coca do not easily root, it is likely that E. coca var. ipadu has been artificially selected for its ease of vegetative propagation.[4] In contrast to the Andean E. coca var. coca, Amazonian E. coca var. ipadu is typically a weaker plant evidenced by the fact that after a few years plants lose their vigor and easily fall prey to disease or insect infestation. Overharvesting can speed up this process.[6]

Amazonian coca is prepared differently than the other three cultivated cocas. After fire-toasting the leaves dry, they are pulverized. Once sifted, the powder is combined with ashes from plants which serve as the necessary alkaline admixture for coca chewing.[6]
See also

Coca alkaloids

References
Citations

Johnson, Emanuel L.; Campbell, T. Austin; Foy, Charles D. (November 1997). "Effect of soil pH on mineral element concentrations of two erythroxylum species". Journal of Plant Nutrition. 20 (11): 1503–1515. doi:10.1080/01904169709365352.
Ferreira, Jorge F. S.; Smeda, Reid J.; Duke, Stephen O. (August 1997). "Control of Coca Plants (Erythroxylum coca and E. novogranatense) with Glyphosate". Weed Science. 45 (4): 551–556. doi:10.1017/S0043174500088809.
Plowman T. "Botanical Perspectives on Coca." Journal of Psychedelic Drugs. 1979. 11(1-2): 103-117.
Plowman T. "The Origin, Evolution, and Diffusion of Coca, Erythroxylum spp., in South and Central America." In: Stone D, ed. Pre-Columbian Plant Migration. Papers of the Peabody Museum of Archaeology and Ethnology. Harvard University. Vol 76. Cambridge MA: Harvard University Press; 1984. p. 125-163.
Bohm B, Ganders F, Plowman T. Biosystematics and Evolution of Cultivated Coca (Erythroxylaceae). Systematic Botany. 1982; 7(2): 121-133.

Plowman T. Amazonian Coca. Journal of Ethnopharmacology. 1981. 3: 195 - 225.

Sources

Turner C. E., Elsohly M. A., Hanuš L., Elsohly H. N. Isolation of dihydrocuscohygrine from Peruvian coca leaves. Phytochemistry 20 (6), 1403-1405 (1981)
History of Coca. The Divine Plant of the Incas by W. Golden Mortimer, M.D. 576 pp. And/Or Press San Francisco, 1974. This title has no ISBN.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Coca". Encyclopædia Britannica. Vol. 6 (11th ed.). Cambridge University Press. pp. 614–615.