Triadenum

Triadenum is a genus of flowering plants in the St. John's wort family, Hypericaceae. The genus is native to North America. Species within Triadenum are herbaceous perennials. They typically feature opposite leaves and showy, star-shaped flowers. The flowers are usually pink or purple, with a distinctive arrangement of stamens. These stamens are often fused at the base into three distinct bundles, which is reflected in the genus name "Triadenum," meaning "three bundles."

The plants are often found in moist or wet habitats, such as bogs, swamps, and stream banks. Triadenum species are important components of these wetland ecosystems. They can also be found in woodlands and meadows. The exact number of species recognized within Triadenum can vary among different taxonomic authorities, but commonly includes species like Triadenum virginicum and Triadenum fraseri. These plants have historically been used in folk medicine, though scientific evidence for their efficacy is often limited.