Erythroxylum coca is one of two species of cultivated coca.
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.
- Erythroxylum coca var. coca
- Erythroxylum coca var. ipadu
- Erythroxylum novogranatense var. novogranatense
- Erythroxylum novogranatense var. truxillense
Erythroxylum coca var. ipadu, also known as Amazonian coca, is closely related to Erythroxylum coca var. coca, from which it originated relatively recently. E. coca var. ipadu does not escape cultivation or survive as a feral or wild plant like E. coca var. coca  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.
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. 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. 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.
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.
- 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.
- 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.
- 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.
- public domain: Chisholm, Hugh, ed. (1911). "Coca". Encyclopædia Britannica. Vol. 6 (11th ed.). Cambridge University Press. pp. 614–615. This article incorporates text from a publication now in the
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