Onopordum acanthium is a flowering plant in the family Asteraceae. It is native to Europe and Western Asia from the Iberian Peninsula east to Kazakhstan, and north to central Scandinavia, and widely naturalised elsewhere, with especially large populations present in the United States and Australia. It is a vigorous biennial plant with coarse, spiny leaves and conspicuous spiny-winged stems.
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 capillifolium, or dog fennel, is a North American perennial herbaceous plant in the family Asteraceae, native to the eastern and south-central United States. It is generally between 50 cm and 2 meters tall with several stems that fork from a substantial base. The stems and base are covered in leaves so dissected that they resemble branching green threads coming out of the stem in fractal patterns. When crushed, the leaves have a sour odor similar to dill pickles. The flowers have a subtle floral odor.
Erigeron canadensis is an annual plant native throughout most of North America and Central America. It is also widely naturalized in Eurasia and Australia. Common names include horseweed, Canadian horseweed, Canadian fleabane, coltstail, marestail, and butterweed. It was the first weed to have developed glyphosate resistance, reported in 2001 from Delaware.
Chromolaena odorata is a tropical and subtropical species of flowering shrub in the family Asteraceae. It is native to the Americas, from Florida and Texas in the United States south through Mexico and the Caribbean to South America. It has been introduced to tropical Asia, West Africa, and parts of Australia.
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 album, or white thoroughwort, is a herbaceous perennial plant in the family Asteraceae native from the eastern and southern United States, from eastern Texas to Connecticut, inland as far as Indiana.
Eupatorium leptophyllum, commonly called false fennel, is a herbaceous perennial plant in the family Asteraceae native to the southeastern United States from Mississippi to the Carolinas. Like other members of the genus Eupatorium, it is about one to two meters tall and has inflorescences containing a large number of tiny white flower heads, each with 5 disc florets but no ray florets. E. leptophyllum grows in wet areas and can grow in shallow water, often at the edges of ponds.
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.
Solidago gigantea is a North American plant species in the family Asteraceae. Its common names include tall goldenrod and giant goldenrod, among others.
Artemisia frigida is a widespread species of flowering plant in the aster family, which is known as the sunflower family. It is native to Europe, Asia, and much of North America. In parts of the north-central and northeastern United States it is an introduced species.
Symphyotrichum georgianum is a rare species of flowering plant in the Asteraceae, the aster family. Its common name is Georgia aster. It is native to the southeastern United States where it is known from Alabama, Florida, Georgia, North Carolina, and South Carolina. As of 2013, it may be extirpated from the state of Florida.
Eupatorium novae-angliae, commonly called New England boneset, New England justiceweed or New England thoroughwort, is a rare and endangered North American species in the family Asteraceae. It is found only in 4 counties in southern New England. The species is listed as endangered species in both states.
