Genus Allionia is a group of flowering plants that belongs to the family Nyctaginaceae. This genus is commonly called "Trailing Four O'Clock" due to the plant's habit of trailing along the ground. The flowers of Allionia species usually bloom in the evening and are often brightly colored. Other synonyms for the genus Allionia include "Mexican Paintbrush," "Windmills," and "Devil's Trumpet." Allionia is native to the Americas and can be found throughout various regions of North, Central, and South America. Allionia species are commonly used in traditional medicine, and certain species are also cultivated as ornamental plants in gardens.