Botanical Overview
Four-o-clock (Mirabilis jalapa) is a flowering plant in the Nyctaginaceae family. Traditional medicine systems have documented several valuable applications for this species, supported by its observed therapeutic effects. This species belongs to the Nyctaginaceae family, a group of flowering plants.
General Description
Mirabilis in Latin means wonderful and Jalapa (or Xalapa) is the state capital of Veracruz in Mexico. Mirabilis jalapa is believed to have been cultivated by the Aztecs for medicinal and ornamental purposes. The flowers usually open from late afternoon or at dusk (namely between 4 and 8 o’clock), giving rise to one of its common names. The flowers then produce a strong, sweet fragrance throughout the night, then close in the morning. New flowers open the following day. It arrived in Europe in 1525. Today, it is common in many tropical regions and is also valued in Europe as an ornamental plant, although not necessarily hardy. It is the children’s state flower of Connecticut under the name of Michaela Petit’s Four O’Clocks.
Geographic Distribution
Four-o-clock has been recorded in 10 countries and territories worldwide, including Brazil, China, Germany, Spain, France, and others.
Traditional Uses
Four-o-clock has been traditionally used for digestive health, skin and wound care, and urinary tract health, among other applications.
Digestive health.
- Purgative
- Vermifuge
- Carminative
- Colic
For digestive complaints, the herb is typically prepared as a tea or decoction taken before meals. The bitter compounds stimulate digestive secretions and improve nutrient absorption. Some traditions use the powdered root or leaves in small doses as a stomachic tonic.
Skin and wound care.
- Abscess
- Boil
- Itch
- Rash
- Sore
- Wound
For skin conditions, the fresh or dried plant is applied topically as a poultice, wash, or compress. A strong decoction can be used to clean wounds and sores. The antimicrobial properties help prevent infection while promoting tissue repair.
Urinary tract health.
- Diuretic
Urinary tract applications typically involve drinking the herb as a mild tea, which increases urine production and helps flush the urinary system. It may be combined with other demulcent herbs to soothe irritated tissues.
Active Compounds
Phytochemical research has identified 12 compounds in this species, including a diverse array of phytochemical classes (see the Complete Chemical Inventory below for the full list).
The identified compounds include the following categories:
- Flavonoid: antioxidant compounds that protect cells from oxidative damage
- Sterol: cholesterol-like compounds with anti-inflammatory properties
- Alkaloid: nitrogenous compounds with diverse pharmacological activities