Nepeta is a genus of about 250 species of flowering plants in the family Lamiaceae. The members of this group are known as catnips or catmints.

The genus is native to Europe, Asia and Africa, with the highest species diversity in the Mediterranean region east to mainland China. Most of the species are herbaceous perennial plants, but some are annuals. They have sturdy stems with opposite heart-shaped, green to greyish-green leaves. The flowers are white, blue, pink or lilac and occur in several clusters toward the tip of the stems.

Medicinal uses

Due to the fact that catnip promotes sweating when used as an herbal tea, it was used for the treatment of nervousness, colds, influenza, and fevers during the Middle Ages. Catnip has also been alleged to aid with flatulence, diarrhea, colic, and other childhood diseases, as well as preventing miscarriages, premature births, and morning sickness. It is also said to promote and speed up hair growth, but this is not proven. It is also sometimes used as an enema (Plants).

As herbal remedies, catnips are used as relaxants, nervines, sedatives, and as antispasmodics. They are used to alleviate symptoms such as insomnia, stress, menstrual cramps, and intestinal discomfort. The effect is a very mild one.

Other uses

A study conducted at Iowa State University suggests that pure nepetalactone, a constituent of the essential oil of Nepeta cataria, may be 10 times as effective at repelling mosquitos as the common repellant, DEET.

Effects on cats

Catnip and catmints are mainly known for, and named after, the effects they have on cats, particularly domestic cats. Approximately two thirds of cats are susceptible to the effects of catnip, as the phenomenon is hereditary.

Catnip contains nepetalactone, a terpene, that is thought to mimic feline sex pheromones. Cats detect it through their vomeronasal organs. When cats sense the bruised leaves or stems of catnip, they will rub in it, roll over it, paw at it, chew it, lick it, leap about and purr. Some cats will also growl and meow. This reaction only lasts for a few minutes before the cat loses interest.[1] It takes up to two hours for the cat to "reset" and then it can come back to the catnip and have the same response as before. Young kittens and older cats are less likely to have a reaction to catnip but big cats, such as tigers, seem to be extremely sensitive to it. Cat toys can contain catnip and some cats love to play with them. Others are not interested. Cat owners do not need to worry about allowing their cats access to catnip because there are, for the most part, no negative side effects to doing so. However, some cats become overly excited when exposed to catnip, so aging or obese cats with heart troubles should be kept away from it. A diabetic cat can also have complications to catnip.[citation needed]

Other plants that also have this effect on cats include valerian and plants that contain actinidine or dihydroactinidiolide (Smith, 2005).

At least three species attract cats: Nepeta cataria, N. grandiflora and N. × faassenii, but most other species have not been tested. Of these, both true catnip and Faassen's catnip have a sharp, biting taste, while the taste of giant catmint is bland.

Effects on other animals

There is anecdotal evidence that coyotes, wolves and some dog/wolf breeds may be susceptible to catnip's intoxicating effects.

Species

Nepeta cataria (Catnip, True Catnip, Catmint or Field Balm) is a 50–100 cm tall herb resembling mint in appearance, with greyish-green leaves; the flowers are white, finely spotted with purple. It has been introduced to many countries, and is now a widespread weed in some areas, including the United States. A lemon-scented cultivar, N. cataria 'Citriodora' looks exactly like true catnip, but has the scent of lemons, and can be used like Lemon balm.

Nepeta grandiflora (Giant Catmint or Caucasus Catmint) is lusher than true catnip, and has dark green leaves and dark blue, almost purple flowers.

Nepeta × faassenii (N. racemosa × N. nepetella; Faassen's Nepeta or Faassen's Catnip) is mostly grown as an ornamental plant. This hybrid is far smaller than either of above, and is almost a ground cover. It has with greyish-green leaves and light purple flowers.

Some Dracocephalum, Glechoma and Calamintha species were formerly classified in Nepeta.

Nepeta species are used as food plants by the larvae of some Lepidoptera species including Coleophora albitarsella.