Despite their global distribution, the systematics and taxonomy of the genus has been described as complicated and unorganized.
Bidens is closely related to the American genus
Coreopsis, and the genera are sometimes difficult to tell apart; in addition, neither is
monophyletic.
Species Species include: •
Bidens alba (L.) DC. – romerillo •
Bidens amplectens Sherff – Waianae kokoolau •
Bidens amplissima Greene – Vancouver Island beggarticks •
Bidens aristosa (Michx.) Britt. – bearded beggarticks, long-bracted beggarticks, tickseed sunflower, western tickseed •
Bidens asymmetrica (Levl.) Sherff – Koolau kokoolau, Ko'olau Range beggarticks •
Bidens aurea (Ait.) Sherff – Arizona beggarticks •
Bidens beckii – Beck's water-marigold, Henderson's water-marigold, Oregon water-marigold •
Bidens bidentoides (Nutt.) Britt. – Delmarva beggarticks •
Bidens bigelovii A.Gray – Bigelow's beggarticks •
Bidens bipinnata L. – Spanish needles, hemlock beggarticks,
gui zheng cao () •
Bidens biternata •
Bidens cabopulmensis •
Bidens campylotheca Sch.Bip.– viper beggarticks •
Bidens cernua L. (syn.
B. glaucescens Greene) – nodding beggarticks, nodding bur-marigold •
Bidens cervicata Sherff – Kauai beggarticks •
Bidens chippii (M.B.Moss) Mesfin •
Bidens conjuncta Sherff – bog beggarticks •
Bidens connata Muhl. ex Willd. – purplestem beggarticks •
Bidens coronata (L.) Britt. – crowned beggarticks •
Bidens cosmoides (A.Gray) Sherff – cosmosflower beggarticks,
poola nui •
Bidens cynapiifolia Kunth – West Indian beggarticks,
alfilerillo •
Bidens discoidea (Torr. & A.Gray) Britt. – discoid beggarticks, small beggarticks, swamp beggarticks, few-bracted beggarticks •
Bidens eatonii Fern. – Eaton's beggarticks, ''bident d'Eaton'' •
Bidens ferulifolia (Jacq.) DC. – Apache beggarticks, fern-leaved beggarticks •
Bidens forbesii Sherff – coastal bluff beggarticks •
Bidens frondosa L. – devil's beggarticks, devil's pitchfork, devil's bootjack, pitchfork weed, common beggarticks, sticktights.
Pitchfork weed (
B. frondosa) is considered to be a
weed in
New Zealand. •
Bidens gardneri Baker – ridge beggarticks •
Bidens hawaiensis A.Gray – Hawaii beggarticks •
Bidens henryi Sherff •
Bidens heterodoxa (Fern.) Fern. & H.St.John – Connecticut beggarticks,
bident différent •
Bidens heterosperma Gray – Rocky Mountain beggarticks •
Bidens hillebrandiana (Drake) O.Deg. – seacliff beggarticks •
Bidens hyperborea Greene – estuary beggarticks, coastal beggarticks, northern estuarine beggarticks, seacliff beggarticks •
Bidens laevis (L.) B.S.P. – smooth beggarticks, smooth bur-marigold, larger bur-marigold.
Smooth beggarticks (
B. laevis) is a common fall
flower in the southeastern United States. •
Bidens lemmonii Gray – Lemmon's beggarticks •
Bidens leptocephala Sherff – few-flowered beggarticks •
Bidens leptophylla •
Bidens macrocarpa (Gray) Sherff – large-fruited beggarticks •
Bidens macroptera (Sch.Bip. ex Chiov.) Mesfin •
Bidens mannii T.G.J.Rayner •
Bidens mauiensis (Gray) Sherff – Maui beggarticks •
Bidens maximowicziana •
Bidens menziesii (Gray) Sherff – Mauna Loa beggarticks •
Bidens meyeri V.A.Funk & K.R.Wood •
Bidens micrantha Gaud. –
grassland beggarticks •
B. micrantha ssp.
kalealaha Nagata & Ganders – Kalealaha beggarticks •
Bidens mitis (Michx.) Sherff – small-fruited beggarticks •
Bidens molokaiensis (Hillebr.) Sherff – Molokai beggarticks, wedge beggarticks •
Bidens × multiceps Fassett •
Bidens nudata Brandegee
– Cape beggar's tick, Baja tickseed •
Bidens parviflora •
Bidens pachyloma – Meskel Flower •
Bidens pilosa S.F.Blake – hairy beggarticks •
Bidens polylepis S.F.Blake •
Bidens populifolia Sherff – Oahu beggarticks •
Bidens radiata •
Bidens reptans (L.) G.Don – manzanilla trepador •
Bidens sandvicensis Less. – shrubland beggarticks •
Bidens schimperi Sch.Bip. •
Bidens simplicifolia C.H.Wright •
Bidens socorrensis •
Bidens squarrosa Kunth •
Bidens subalternans DC. •
Bidens tenuisecta A.Gray – slim-lobed beggarticks •
Bidens torta Sherff – corkscrew beggarticks •
Bidens trichosperma (Michx.) Britton – crowned beggarticks •
Bidens tripartita L. (syn.
B. acuta,
B. comosa) – three-lobed beggarticks, three-part beggarticks, leafy-bracted beggarticks, trifid bur-marigold •
Bidens triplinervia Kunth •
B. triplinervia var.
macrantha (Wedd.) Sherff •
Bidens valida Sherff – Mt. Kahili beggarticks •
Bidens vulgata Greene – big devil's beggarticks, tall beggarticks, tall bur-marigold, western sticktight •
Bidens wiebkei Sherff – Wiebke's beggarticks
Formerly placed here •
Cosmos atrosanguineus (Hook.) Voss (as
B. atrosanguinea (Hook.) Ortgies ex Regel) •
Cosmos bipinnatus Cav. (as
B. formosa (Bonato) Sch.Bip.) •
Melanthera nivea (L.) Small (as
B. nivea L.) •
Salmea scandens (L.) DC. (as
B. scandens L.) •
Thelesperma megapotamicum (Spreng.) Kuntze (as
B. megapotamica Spreng.) ==Distribution==