Cephalanthus

Cephalanthus is a genus of flowering plants in the family Rubiaceae. The most well-known species is Cephalanthus occidentalis, commonly known as buttonbush. This genus is characterized by its distinctive spherical flower heads, which resemble buttons, and its opposite or whorled leaves. Buttonbush is a deciduous shrub native to North America, found in wet habitats such as swamps, stream banks, and lake shores. Its flowers are white and fragrant, attracting a variety of pollinators, including bees and butterflies. The fruit is a small, woody capsule that persists through winter. Other species of Cephalanthus are found in Asia and Africa. The genus name is derived from the Greek words "kephalos" (head) and "anthos" (flower), referring to the capitate inflorescences. While not widely cultivated for ornamental purposes, buttonbush is valued for its ecological role in providing habitat and food for wildlife in wetland areas. Its adaptability to wet conditions makes it useful for erosion control and for landscaping in moist garden settings. The plant has a history of traditional medicinal uses by Native American tribes.