|Flowers of the plant|
Nepeta cataria, commonly known as catnip, catswort, or catmint, is a species of the genus Nepeta in the family Lamiaceae, native to southern and eastern Europe, the Middle East, central Asia, and parts of China. It is also widely naturalized in northern Europe, New Zealand, and North America. The common name catmint can also refer to the genus as a whole. The names catnip and catmint are derived from the intense attraction most cats have towards them.
Nepeta cataria is a short-lived herbaceous perennial, growing 50–100 cm (20–39 in) tall and wide. It resembles a typical mint family member in appearance by having the characteristic square stem that members of the Lamiaceae plant family have, but with brown-green foliage. The coarse-toothed leaves are triangular to ovate.
Nepeta cataria was one of the many species described by Linnaeus in 1753 in his landmark work Species Plantarum. He had previously described it in 1738 as Nepeta floribus interrupte spicatis pedunculatis (meaning "Nepeta with flowers in a stalked, interrupted spike"), before the commencement of Linnaean taxonomy.
The plant is drought-tolerant and deer-resistant. It can be a repellent for certain insects, including aphids and squash bugs. Catnip is best grown in full sunlight and grows as a loosely branching, low perennial. 
Varieties include Nepeta cataria var. citriodora (or N. cataria subsp. citriodora), or "lemon catnip".
Nepetalactone is a mosquito and fly repellent. Oil isolated from catnip by steam distillation is a repellent against insects, in particular mosquitoes, cockroaches and termites. Research suggests that, while ten times more effective than DEET, it is not as effective as a repellent when used on the skin when compared with DEET or SS220.
Effect on humans
Nepeta cataria can be brewed to produce a herbal tea. It is also used as a culinary herb for many dishes. Catnip can also be ingested through smoking the herb. It has only a negligible effect on relaxation, like other herbal cigarettes.[not in citation given]
Catnip has a history of medicinal use for a variety of ailments. The plant has been consumed as a tea, juice, tincture, infusion or poultice, and has also been smoked. However, its medicinal use has fallen out of favor with the development of more commonplace pharmaceutical drugs.
Effect on cats
Catnip contains the feline attractant nepetalactone. Nepeta cataria (and some other species within the genus Nepeta) are known for their behavioral effects on the cat family, not only on domestic cats but also other species of cats. Several tests showed that leopards, cougars, servals, and lynxes often reacted strongly to catnip in a manner similar to domestic cats and while lions and tigers can react strongly as well, they do not react as consistently.
With domestic cats, N. cataria is used as a recreational substance for pet cats' enjoyment, and catnip and catnip-laced products designed for use with domesticated cats are available to consumers. Common behaviors cats display when they sense the bruised leaves or stems of catnip are rubbing on the plant, rolling on the ground, pawing at it, licking it, and chewing it. Consuming much of the plant is followed by drooling, sleepiness, anxiety, leaping about and purring. Some growl, meow, scratch or bite at the hand holding it. The main response period after exposure is generally between five and fifteen minutes, after which olfactory fatigue usually sets in.:p.107
Other plants that also have this effect on cats include valerian (Valeriana officinalis) and plants that contain actinidine. Some domestic house cats that do not react to catnip may react to Tartarian honeysuckle in a manner similar to those that do.:p.108
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