Ageratina altissima, also known as white snakeroot, richweed, or white sanicle, is a poisonous perennial herb in the family Asteraceae, native to eastern and central North America. An older binomial name for this species is Eupatorium rugosum, but the genus Eupatorium has undergone taxonomic revision by botanists, and some species once included in it have been moved to other genera.
Eupatorium is a genus of flowering plants in the family Asteraceae, containing from 36 to 60 species depending on the classification system. Most are herbaceous perennials growing to 0.5–3 m (1.6–9.8 ft) tall. A few are shrubs. The genus is native to temperate regions of the Northern Hemisphere. Most are commonly called bonesets, thoroughworts or snakeroots in North America. The genus is named for Mithridates Eupator, king of Pontus.
Eupatorium altissimum, with the common names tall thoroughwort and tall boneset, is a perennial herbaceous plant in the Asteraceae family with a native range including much of the eastern and central United States and Canada. It is a tall plant found in open woods, prairies, fields, and waste areas, with white flowers that bloom in the late summer and fall.
Eupatorium serotinum, also known as late boneset or late thoroughwort, is a fall-blooming, perennial, herbaceous plant native to North America.
Eupatorium hyssopifolium, also known as hyssopleaf thoroughwort, is a fall-blooming herbaceous plant native to North America. Like other members of the genus Eupatorium it has inflorescences containing a large number of very small flower heads, each with 5 white disc florets but no ray florets. At 0.5 to one meter tall, it is towards the shorter end of the range of heights found in Eupatorium species.
Eupatorium compositifolium, commonly called yankeeweed and coastal dog fennel, is a North American herbaceous perennial plant in the family Asteraceae native to the southern United States. Like other members of the genus Eupatorium it has inflorescences containing a large number of small, white flower heads, each with 5 disc florets but no ray florets. The plant is 0.5 to 2 meters tall. Flowers bloom August to October. Its habitats include sand dunes, disturbed areas, and flat-woods.
Eupatorium mikanioides, commonly called semaphore thoroughwort, is a herbaceous perennial plant in the family Asteraceae found only in the US state of Florida.
Eupatorium mohrii, commonly called Mohr's thoroughwort, is a herbaceous perennial plant in the family Asteraceae native to the southeastern and south-central states of the United States, in the coastal plain from Virginia to Texas. It has also been found in the Dominican Republic.
Eupatorium resinosum, the pine barren thoroughwort, is a rare North American plant species in the family Asteraceae.
Eupatorium rotundifolium, commonly called roundleaf thoroughwort, is a North American species of plant in the family Asteraceae. It native to the eastern and central United States, in all the coastal states from Maine to Texas, and inland as far as Missouri and the Ohio Valley. It is found in low, moist habitats such as wet savannas and bogs.
Eupatorium semiserratum, commonly called smallflower thoroughwort, is a North American plant species in the family Asteraceae. It is native to the southeastern and south-central United States, found in all the coastal states from Maryland to Texas and inland as far as Missouri and Kentucky.
Eupatorium sessilifolium, commonly called upland boneset or sessile-leaved boneset, is a North American plant species in the family Asteraceae. It is native to the eastern and central United States, found from Maine south to North Carolina and Alabama, and west as far as Arkansas, Kansas, and Minnesota.
Ageratina occidentalis is a species of flowering plant in the family Asteraceae known by the common name western snakeroot or western eupatorium. It is native to the western United States where it grows in several types of habitat. It is found in California, Oregon, Washington, Idaho, Montana, Nevada, and Utah.
Erigeron pulchellus, the Robin's plantain, blue spring daisy or hairy fleabane, is a North American species of plants in the family Asteraceae. It is widespread across much of the United States and Canada from Québec and Ontario south as far as eastern Texas and the Florida Panhandle.
Ageratina luciae-brauniae is a species of flowering plant in the family Asteraceae known by the common names Lucy Braun's snakeroot and rockhouse white snakeroot. It is native to the eastern United States, where it is limited to the Cumberland Plateau of Kentucky and Tennessee. It may also occur in South Carolina but these reports are unconfirmed.
Chromolaena ivifolia called ivy-leaf false thoroughwort, or ivyleaf thoroughwort, is a species of flowering shrub in the family Asteraceae. It is native to North America and South America, from the south-eastern United States to Argentina.
Chromolaena frustrata called Cape Sable false thoroughwort, or Cape Sable thoroughwort, is a rare North American species of flowering shrub in the family Asteraceae. It is found only in southern Florida, on the Florida Keys, inside Everglades National Park, and other nearby low-lying areas. It grows on coastal rock outcrops, the edges of hammocks, and other undisturbed sites at elevations less than 10 meters above sea level.
Chromolaena bigelovii called Bigelow's false thoroughwort, or Bigelow's thoroughwort, is a North American species of flowering shrub in the family Asteraceae. It is native to northeastern Mexico and the US State of Texas.
Eupatorium godfreyanum, commonly called Godfrey’s thoroughwort, is a North American species of plants in the family Asteraceae. It is found in the east-central United States, primarily from Pennsylvania to North Carolina, with a few isolated populations west of the Appalachians in Ohio, Kentucky, and Tennessee.
Eupatorium anomalum, commonly called Florida thoroughwort, is a North American species in the family Asteraceae. It grows in the southeastern United States from Alabama to Virginia. Molecular investigations suggest that it originated as a hybrid between E. serotinum and E. mohrii but it is well-established on its own as a distinct species.
