Hypericaceae is a plant family in the order Malpighiales, comprising six to nine genera and up to 700 species, and commonly known as the St. John's wort family. Members are found throughout the world apart from extremely cold or dry habitats. Hypericum and Triadenum occur in temperate regions but other genera are mostly tropical.
Triadenum, known as marsh St. John's worts, is a small genus of flowering plants in the family Hypericaceae. The genus is characterized by opposite, blunt-tipped leaves and pink flowers with 9 stamens. They are distributed in North America and eastern Asia.
Hypericum maculatum, commonly known as imperforate St John's-wort, or spotted St. Johnswort, is a species of perennial herbaceous flowering plant in the family Hypericaceae. It is native to Europe and Western Asia where it grows in moist meadows.
Hypericum gramineum, commonly known as small St. John's wort or grassy St. Johnswort, is species of flowering plant in the St. Johns wort family Hypericaceae. It is found in parts of Southeast Asia, Oceania, and the Pacific.
Triadenum fraseri, commonly known as bog St. John's wort, Fraser's St. John's wort, and Fraser's marsh St. John's wort, is a perennial flowering plant in the family Hypericaceae that grows in wetlands of Canada and the northern United States. It is named after John Fraser (1750–1811), a Scottish botanist and widely travelled plant collector.
Hypericum ascyron, the great St. Johnswort or giant St. John's wort is a flowering plant in the family Hypericaceae.
Hypericum buckleyi, known as Blue Ride St. John's wort and Buckley's St. Johnswort, is a rare species of flowering plant in the family Hypericaceae found only in the Appalachian Mountains of the southeastern United States. The species is listed in the state of Georgia (S1), South Carolina (SX), and North Carolina (S3).
Hypericum kalmianum, commonly called Kalm's St. Johns wort or Kalm's St. Johnswort, is a flowering plant in the St. John's wort family Hypericaceae. It is native to the Great Lakes region in the northern United States and southern Canada. Hypericum kalmianum was named after its discoverer, Swedish botanist Pehr Kalm (1715-1779).
Hypericum tenuifolium, known as Atlantic St. John's-wort and sandhill St. John's-wort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is native to the Southeastern United States.
Hypericum suffruticosum, known as pineland St. John's-wort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is native to the Southeastern United States.
Hypericum galioides, the bedstraw St. Johnswort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is endemic to the Southeastern United States.
Hypericum tetrapetalum, the fourpetal St. Johnswort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is found in the Southeastern United States and Cuba. It was first described by Jean-Baptiste Lamarck in 1797.
Hypericum myrtifolium, the myrtleleaf St. Johnswort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is endemic to the Southeastern United States. It was first described by Jean-Baptiste Lamarck in 1797.
Hypericum virginicum, the marsh St. Johns-wort or Virginia marsh St. Johnswort, is a species of flowering plant in the family Hypericaceae. It is native to the central and eastern United States and eastern Canada.
Hypericum frondosum, the cedarglade St. Johnswort or golden St. John's wort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is native to the central and southeastern United States in dry, rocky habitats.
Hypericum erythreae, the Georgia St. John's-wort, sparse-leaved St. John's-wort, or grit St. Johnswort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is native to the southeastern United States in seepage bogs and roadside ditches. Its name grit St. Johnswort comes from its limited distribution, within the Altamaha Grit region of the Georgia coastal plain.
Hypericum fasciculatum, known as peelbark St. Johnswort or sandweed, is a species of flowering plant in the St. Johnswort family, Hypericaceae, native to the southeastern United States. It is found from eastern North Carolina, south to southern Florida, west to eastern Louisiana. Kew's Plants of the World Online database also notes that it occurs in Cuba, though Cuba is not listed in several other sources. It was first described in 1797 by Jean-Baptiste Lamarck.
Hypericum lobocarpum, commonly called fivelobe St. Johnswort, is a species of flowering plant in the St. Johnswort family (Hypericaceae). It is native eastern to North America, where it is found primarily in the western portion of the southeastern United States. Its typical natural habitat is in open wet areas, such as stream banks, lake margins, swamps, and pine savannas.
Hypericum walteri, the greater marsh St. Johnswort or Walter's marsh St. John's Wort, is a flowering plant endemic to the eastern United States, from Texas to Delaware north to Illinois. It grows along waterbodies such as lakes and streams, in marshes, and in swamp forests.
