Coriander (Coriandrum sativum), also known as cilantro, Chinese parsley or dhania, is an annual herb in the family Apiaceae. Coriander is native to regions spanning from southern Europe and North Africa to southwestern Asia. It is a soft, hairless plant growing to 50 cm (20 in) tall. The leaves are variable in shape, broadly lobed at the base of the plant, and slender and feathery higher on the flowering stems. The flowers are borne in small umbels, white or very pale pink, asymmetrical, with the petals pointing away from the centre of the umbel longer (5–6 mm) than those pointing towards it (only 1–3 mm long). The fruit is a globular, dry schizocarp 3–5 mm (0.12–0.20 in) in diameter.
First attested in English late 14th century, the word coriander derives from the Old French coriandre, which comes from Latin coriandrum, in turn from Greek κορίαννον (koriannon). The earliest attested form of the word is the Mycenaean Greek ko-ri-ja-da-na (written in Linear B syllabic script, reconstructed as koriadnon), similar to the name of Minos' daughter Ariadne, which later evolved to koriannon or koriandron.
Cilantro is the Spanish word for coriander, also deriving from coriandrum. It is the common term in North America, due to its extensive use in Mexican cuisine.
All parts of the plant are edible, but the fresh leaves and the dried seeds are the parts most traditionally used in cooking. Coriander is common in South Asian, Southeast Asian, Middle Eastern, Central Asian, Mediterranean, Indian, Tex-Mex, Latin American, Portuguese, Chinese, African, and Scandinavian cuisine.
The leaves are variously referred to as coriander leaves, fresh coriander, Chinese parsley, or cilantro (particularly in North America).
It should not be confused with culantro (Eryngium foetidum L.) which is a close relative to coriander (Coriandrum sativum L.) but has a distinctly different appearance, a much more potent volatile leaf oil and a stronger smell.
The leaves have a different taste from the seeds, with citrus overtones. However, many people experience an unpleasant "soapy" taste or a rank smell and avoid the leaves. The flavours have also been compared to those of the stink bug, and similar chemical groups are involved (aldehydes). There appears to be a genetic component to the detection of "soapy" versus "herby" tastes.
The fresh leaves are an ingredient in many South Asian foods (such as chutneys and salads), in Chinese dishes, in Mexican cooking, particularly in salsa and guacamole and as a garnish, and in salads in Russia and other CIS countries. Chopped coriander leaves are a garnish on Indian dishes such as dal. As heat diminishes their flavour, coriander leaves are often used raw or added to the dish immediately before serving. In Indian and Central Asian recipes, coriander leaves are used in large amounts and cooked until the flavour diminishes. The leaves spoil quickly when removed from the plant, and lose their aroma when dried or frozen.
The dry fruits are known as coriander or coriandi seeds. In India they are called dhania. The word "coriander" in food preparation may refer solely to these seeds (as a spice), rather than to the plant. The seeds have a lemony citrus flavour when crushed, due to terpenes linalool and pinene. It is described as warm, nutty, spicy, and orange-flavoured.
The variety C. s. vulgare has a fruit diameter of 3–5 mm (0.12–0.20 in), while var. microcarpum fruits have a diameter of 1.5–3 mm (0.059–0.12 in). Large-fruited types are grown mainly by tropical and subtropical countries, e.g. Morocco, India and Australia, and contain a low volatile oil content (0.1-0.4%). They are used extensively for grinding and blending purposes in the spice trade. Types with smaller fruit are produced in temperate regions and usually have a volatile oil content of around 0.4-1.8%, so are highly valued as a raw material for the preparation of essential oil.
It is commonly found both as whole dried seeds and in ground form. Seeds can be roasted or heated on a dry pan briefly before grinding to enhance and alter the aroma. Ground coriander seed loses flavour quickly in storage and is best ground fresh.
Coriander seed is a spice in garam masala and Indian curries, which often employ the ground fruits in generous amounts together with cumin. It acts as a thickener. Roasted coriander seeds, called dhana dal, are eaten as a snack. It is the main ingredient of the two south Indian dishes: sambhar and rasam. Coriander seeds are boiled with water and drunk as indigenous medicine for colds.
Outside of Asia, coriander seed is used for pickling vegetables, and making sausages in Germany and South Africa (see boerewors). In Russia and Central Europe, coriander seed is an occasional ingredient in rye bread as an alternative to caraway. Coriander seeds are used in European cuisine today, though they were more important in former centuries. The Zuni people have adapted it into their cuisine, mixing the powdered seeds ground with chile and using it a condiment with meat, and eating leaves as a salad.
Coriander grows wild over a wide area of the Near East and southern Europe, prompting the comment, "It is hard to define exactly where this plant is wild and where it only recently established itself." Fifteen desiccated mericarps were found in the Pre-Pottery Neolithic B level of the Nahal Hemel Cave in Israel, which may be the oldest archaeological find of coriander. About half a litre of coriander mericarps were recovered from the tomb of Tutankhamen, and because this plant does not grow wild in Egypt, Zohary and Hopf interpret this find as proof that coriander was cultivated by the ancient Egyptians.
Coriander seems to have been cultivated in Greece since at least the second millennium BC. One of the Linear B tablets recovered from Pylos refers to the species as being cultivated for the manufacture of perfumes, and it appears that it was used in two forms: as a spice for its seeds and as a herb for the flavour of its leaves. This appears to be confirmed by archaeological evidence from the same period: the large quantities of the species retrieved from an Early Bronze Age layer at Sitagroi in Macedonia could point to cultivation of the species at that time.
Coriander was brought to the British colonies in North America in 1670, and was one of the first spices cultivated by early settlers.
Similar plants 
Other herbs are used where they grow in much the same way as coriander leaves.
- Eryngium foetidum has a similar, but more intense, taste. It is known as culantro, and is found in Mexico, South America and the Caribbean.
- Persicaria odorata is commonly called Vietnamese coriander, or rau răm. The leaves have a similar odour and flavour to coriander. It is a member of the Polygonaceae, or buckwheat family.
- Papaloquelite is one common name for Porophyllum ruderale subsp. macrocephalum, a member of the Compositae or Asteraceae, the sunflower family. This species is found growing wild from Texas to Argentina.
Health effects and medicinal uses 
Coriander, like many spices, contains antioxidants, which can delay or prevent the spoilage of food seasoned with this spice. A study found both the leaves and seed to contain antioxidants, but the leaves were found to have a stronger effect.
Chemicals derived from coriander leaves were found to have antibacterial activity against Salmonella choleraesuis, and this activity was found to be caused in part by these chemicals acting as nonionic surfactants.
Coriander has been used as a folk medicine for the relief of anxiety and insomnia in Iran. Coriander seeds are used in traditional Indian medicine as a diuretic by boiling equal amounts of coriander seeds and cumin seeds, then cooling and consuming the resulting liquid. In holistic and traditional medicine, it is used as a carminative and as a digestive aid.
Coriander seeds were found in a study on rats to have a significant hypolipidaemic effect, resulting in lowering of levels of total cholesterol and triglycerides, and increasing levels of high-density lipoprotein. This effect appeared to be caused by increasing synthesis of bile by the liver and increasing the breakdown of cholesterol into other compounds.
Coriander leaf was found to prevent deposition of lead in mice, due to a presumptive chelation of lead by substances in the plant. 
The essential oil produced from Coriandrum sativum has been shown to exhibit antimicrobial effects. 
Variation in taste response 
A minority of people find the taste and smell reminiscent of soap, and thus find it offensive. The reason is likely genetic, with some people having no response to the aromatic chemical that most find pleasant, while simultaneously being sensitive to certain offending unsaturated aldehydes.
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- NPR story about how people taste cilantro/coriander (December 2008)
Further reading 
- Katzer, Gernot Coriander Seeds and Cilantro (Coriandrum sativum)
- Noxon, Heather and Meyer, Alex (2004). Genetic Analysis of PTC and Cilantro Taste Preferences. MindExpo 2004
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