Bidens is a genus of flowering plants in the aster family, Asteraceae. The genus include roughly 230 species which are distributed worldwide. Despite their global distribution, the systematics and taxonomy of the genus has been described as complicated and unorganized. The common names beggarticks, black jack, burr marigolds, cobbler's pegs, Spanish needles, stickseeds, tickseeds and tickseed sunflowers refer to the fruits of the plants, most of which are bristly and barbed. The generic name refers to the same character; Bidens comes from the Latin bis ("two") and dens ("tooth").
Bidens frondosa is a North American species of flowering plant in the aster family, Asteraceae. It is widespread across much of Canada, the United States, and Mexico It is known in many other parts of the world as an introduced species, including Europe, Asia, Morocco, and New Zealand. Its many common names include devil's beggarticks, devil's-pitchfork, devil's bootjack, sticktights, bur marigold, pitchfork weed, tickseed sunflower, leafy beggarticks, and common beggar-ticks.
Bidens cernua is a species of flowering plant in the aster family, Asteraceae. Bidens cernua is distributed throughout much of Eurasia and North America. It is commonly called nodding beggarticks or nodding bur-marigold.
Bidens laevis is a species of flowering plant in the daisy family known by the common names larger bur-marigold and smooth beggarticks. It is native to South America, Mexico, and the southern and eastern United States. It grows in wetlands, including estuaries and riverbanks.
Bidens vulgata is a species of flowering plant in the family Asteraceae known by the common names big devils beggarticks and tall beggarticks. It is native to eastern and central North America from Nova Scotia to northern Georgia and as far west as the Rocky Mountains. It is an introduced species on the West Coast of North America as well as parts of Europe.
Bidens aristosa is a North American species of plant in the sunflower family. Common names include bearded beggarticks, western tickseed, showy tickseed, long-bracted beggarticks, tickseed beggarticks, swamp marigold, and Yankee lice. It is native to the central United States, but has been introduced to the eastern United States and can be found in south-central Canada, from Maine south to Florida and west as far as Ontario, Texas, and Nebraska. It grows in wet meadows and abandoned fields.
Bidens amplissima, also known as the Vancouver Island beggarticks, is an annual wetland species in the family Asteraceae which displays a broad range of morphological variation and has a geographic range restricted to southwestern British Columbia and adjacent Washington State. Due to its limited global range and susceptibility to anthropogenic threats, B. amplissima is federally listed as Special Concern under Canada's Species at Risk Act and is blue-listed in British Columbia. Bidens amplissima shares a variety of morphological characteristics with two closely related species, B. cernua and B. tripartita, making identification challenging. Accurate identification also often depends on multiple morphological characters such as leaf shape, ray florets and achene shape.
Bidens aurea , the Arizona beggarticks, is a North American species of flowering plant in the family Asteraceae. It is widespread across much of Mexico and found also in Arizona and Guatemala. The species is also naturalized in parts of Europe and South America.
Bidens beckii, commonly called Beck's water-marigold or simply water marigold is a species of flowering plant in the family Asteraceae. It is native to Canada and the northern United States.
Bidens bidentoides is an uncommon North American species of flowering plant in the family Asteraceae. It is native to the northeastern and east-central parts of the United States, the coastal plain of the States of Maryland, Delaware, Pennsylvania, and New Jersey plus the region around the Hudson River estuary in New York. Common name is Delmarva beggar-ticks, in reference to the Delmarva Peninsula in Delaware, eastern Maryland, and eastern Virginia.
Bidens bigelovii is a North American species of flowering plant in the family Asteraceae. It is native to the southwestern and south-central United States and to Mexico as far south as Oaxaca.
Bidens connata , the purplestem beggarticks or London bur-marigold, is a species of flowering plant in the family Asteraceae. It is widespread across much of Eurasia, North Africa, and North America, and naturalized in Australia and on certain Pacific Islands.
Bidens discoidea, the small beggarticks, is a North American species of flowering plant in the family Asteraceae. It is widespread across eastern Canada and the eastern and central United States, from Nova Scotia west to Minnesota, south to Florida and Texas.
Bidens eatonii is a North American species of flowering plant in the family Asteraceae. It is native to eastern Canada and the northeastern United States.
Bidens heterodoxa, the Connecticut beggarticks, is a North American species of flowering plant in the family Asteraceae. It is native to eastern Canada and the northeastern United States (Connecticut).
Bidens lemmonii is a North American species of flowering plant in the family Asteraceae. It is native to the southwestern United States and Mexico.
Bidens leptocephala, the fewflower beggarticks, is a North American species of flowering plant in the family Asteraceae. It is native to the southwestern United States and northern Mexico.
Bidens mitis, the smallfruit beggarticks, is a North American species of flowering plant in the family Asteraceae. It is native to the eastern, southeastern, and south-central parts of the United States, from eastern Texas to southern New Jersey.
Bidens tenuisecta , the slim lobe beggarticks, is a North American species of flowering plant in the family Asteraceae. It is native to northern Mexico (Chihuahua) and the western United States. There are also reports of populations in the northeastern United States but these are almost assuredly introductions.
Erigeron elatus is a North American species of flowering plants in the family Asteraceae known by the common names swamp fleabane and swamp boreal-daisy.
