Cephalanthus occidentalis

Species of flowering plant

Cephalanthus occidentalis is a species of flowering plant in the family Rubiaceae that is native to eastern and southern North America. Common names include buttonbush, common buttonbush, button willow, buck brush, and honey bells.

Cephalanthus occidentalis is a deciduous shrub or small tree that averages in height, but can reach The leaves are opposite or in whorls of three, elliptic to ovate, long and broad, with a smooth edge and a short petiole. The flowers are arranged in a dense spherical inflorescence in diameter on a short peduncle. Each flower has a fused white to pale yellow four lobed corolla forming a long slender tube connecting to the sepals. The stigma protrudes slightly from the corolla. The fruit is a spherical cluster of achenes (nutlets).

Buttonbush is a common shrub of many wetland habitats in its range, including swamps, floodplains, mangrove, pocosin, riparian zones, and moist forest understory. It is a member of the flora in the Everglades. Deer browse the foliage, which is poisonous to livestock. Insects and hummingbirds take the nectar, with bees using it to make honey.

The species occurs in eastern North America with disjunct populations occurring in the west. In Canada, it occurs from southern Ontario and Quebec east to New Brunswick and south western Nova Scotia. Besides the eastern United States, and eastern regions of the Midwest, notable areas range into Arizona, the Mogollon Rim, and other mountain ranges; in California, the entire San Joaquin Valley West of the Great Plains and the Rocky Mountains, only western Texas, Arizona, and California find C. occidentalis.

Cephalanthus occidentalis has a number of historical medicinal uses, but it is also toxic due to the presence of cephalanthin.

Buttonbush is cultivated as an ornamental plant for a nectar source or 'honey plant' and for aesthetics in gardens and native plant landscapes, and is planted on slopes to help control erosion. Buttonbush is a suitable shrub for butterfly gardens.

The town of Buttonwillow, California was named for the buttonbush (Cephalanthus occidentalis). A lone buttonbush served as a landmark on an old trans San Joaquin Valley trail, and was used by ancient Yokuts as a meeting place. It later became the site of settlers' stock rodeos. This buttonbush tree is listed as California Historical Landmark No. 492, and is now known as the "Buttonwillow Tree".