Rivinia

Rivinia is a genus of flowering plants in the family Aizoaceae, commonly known as the carpet weed family. The genus was first described by Carl Linnaeus in 1753. Plants in the genus Rivinia are typically low-growing, spreading herbs or subshrubs. They are characterized by their simple, opposite leaves and small, inconspicuous flowers, which are usually white or pink. The fruits are small berries.

Species within the genus Rivinia are found in tropical and subtropical regions of the Americas. They often grow in disturbed areas, such as roadsides, wastelands, and open fields. Some species are considered weeds due to their invasive nature in certain environments.

The most well-known species is Rivinia humilis, often referred to as baby's tears or pigeonberry. This species is widely distributed in the warmer parts of North and South America and the Caribbean. It is sometimes cultivated as a ground cover in gardens, particularly in warmer climates, though it can spread aggressively.

The taxonomy of the genus Rivinia has undergone revisions, with some previously recognized species now being classified under other genera. Current botanical consensus generally recognizes a limited number of species within Rivinia. The genus name honors the botanist Franz Rivinus.