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Bidens is a genus of flowering plants in the aster family , Asteraceae. 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, with two sharp pappi at the end. The generic name refers to the same character; Bidens comes from the Latin bis "two" and dens "tooth". The plants are zoochorous ; their seeds will stick to clothing, fur or feathers, and be carried to new habitat.
This has enabled them to colonize a wide range, including many oceanic islands. Some of these species occur only in a very restricted range and several are now threatened with extinction , notably in the Hawaiian Islands. Due to the absence of native mammals on these islands, some of the oceanic island taxa have reduced burrs, evolving features that seem to aid in dispersal by the wind instead.
Bidens is distributed throughout the tropical and warm temperate regions of the world. Nodding beggarticks B. Several Bidens species are used as food by the caterpillars of certain Lepidoptera , such as the noctuid moth Hypercompe hambletoni and the brush-footed butterfly Vanessa cardui , the painted lady. The Bidens mottle virus , a plant pathogen , was first isolated from B. The taxonomy of Bidens has been described as "chaotic",  and it is not clear how many taxa are included in its bounds.
There are probably at least to species,   and some estimates fall around Species include:    . From Wikipedia, the free encyclopedia. This article is about the plant genus. For the Biden family, see Biden family. For the sticktight flea, see Echidnophaga gallinacea. Germplasm Resources Information Network.
United States Department of Agriculture. Archived from the original on Retrieved Flora of North America. New South Wales Flora Online. Systematic Botany 25 1 Phylogeny of Eastern North American Coreopsis Asteraceae-Coreopsideae : insights from nuclear and plastid sequences, and comments on character evolution. American Journal of Botany 92 2 , Hawaiian Native Plant Genera - Asteraceae. Flora of China.
The Jepson eFlora Integrated Taxonomic Information System. Hybridization and agamospermy of Bidens in northwestern Ontario. Taxon 30 4 : Hidden categories: Webarchive template archiveis links Articles with 'species' microformats Articles containing Chinese-language text Commons category link is on Wikidata Wikipedia articles incorporating a citation from the New International Encyclopedia Taxonbars with 20—24 taxon IDs.
Diatonta Walp. Microlecana Sch. Delucia DC. Bidens sect. Eubidens Boerl. Dolichotheca Cass. Edwarsia Neck. Kerneria Moench Ceratocephalus Vaill. Bidens subg. Kerneria Cass. Adenolepis Boerl.
Bidens andicola Kunth