Roionissa

Roionissa is a genus of flowering plants in the family Asteraceae, commonly known as the daisy family. The genus was first described in 1867. Plants in the genus Roionissa are typically small herbaceous perennials with a rosette of leaves at the base. The flower heads are solitary or borne in clusters, and are composed of ray florets and disc florets. The ray florets are usually white or pink, and the disc florets are typically yellow. Roionissa species are native to the Mediterranean region, where they are found in a variety of habitats, including grasslands, rocky slopes, and coastal areas. The exact number of species in the genus is debated, with some sources listing as few as four and others as many as ten. Roionissa plants are often cultivated for their ornamental value, and are popular in rock gardens and cottage gardens. They are generally easy to grow and prefer well-drained soil and full sun. Some species are also known for their medicinal properties, although their use in traditional medicine varies by region. Further research into the genus Roionissa is ongoing, with a focus on its taxonomy, evolutionary history, and potential applications.