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").
Melampodium is a genus of flowering plants in the sunflower family.
Symphyotrichum eatonii is a species of aster known by the common name Eaton's aster. It is native to much of western North America from British Columbia to Saskatchewan, the Sierra Nevada in California, the Rocky Mountains region, to Arizona and New Mexico, where it grows in many habitats, especially wet areas such as meadows and near ditches.
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.
Melanthera, is a genus of perennial flowering plants in the family Asteraceae, native to North and South America, as well as Africa, Asia and Oceania, including Hawaiʻi.
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 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 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.
Carminatia tenuiflora (plumeweed) is a species of annual plants in the family Asteraceae. It is native primarily to Mexico, but also the southwestern United States and Central America.
Cirsium horridulum, called bristly thistle, purple thistle", or "yellow thistle is a North American species of plants in the tribe Cardueae within the family Asteraceae. It is an annual or biennial. The species is native to the eastern and southern United States from New England to Florida, Texas, and Oklahoma as well as to Mexico, Belize, Guatemala, Honduras, and the Bahamas.
Coreocarpus arizonicus, the little lemonhead, is a North American species of flowering plants in the daisy family native to northwestern Mexico and the southwestern United States. It has been found in southern Arizona, and in the adjacent Mexican States of Sonora, Chihuahua, Sinaloa, and Baja California Sur.
Erigeron jamaicensis is a Caribbean and Mesoamerican species of flowering plant in the family Asteraceae commonly called Jamaican fleabane. It is native to Mexico, Central America, and the Greater Antilles.
Tagetes nelsonii is a Mexican species of marigold in the family Asteraceae. It is native to Guatemala and to the State of Chiapas in southern Mexico.
Heterosperma pinnatum, the wingpetal, is a New World species of plants in the sunflower family. It has a discontinuous distribution in North and South America, having been found in Bolivia, Venezuela, Mexico, Guatemala, Honduras, and the south-western United States,
Hieracium abscissum is a species of plant in the tribe Cichorieae within the family Asteraceae. It is considered to be native to the south-western United States, Mexico and Central America.
Hieracium schultzii, the roughstem hawkweed, is a species of plant in the tribe Cichorieae within the family Asteraceae. It is widespread across much of Mexico with a few populations in Guatemala and western Texas.
Lactuca graminifolia, the grassleaf lettuce is a North American species of wild lettuce. It grows in Mexico, Central America, Hispaniola, and the southern United States from Arizona to Florida, Virginia and the Carolinas.
