Bidens polylepisS.F.Blake

WFO wfo-0000043510 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Bidens polylepis, photographed by E. Millman
fig. a E. Millman, CC BY 4.0 / 2021-09-10 / obs. 157140213
Bidens polylepis, photographed by E. Millman
fig. b E. Millman, CC BY 4.0 / obs. 157140138
Bidens polylepis, photographed by E. Millman
fig. c E. Millman, CC BY 4.0 / obs. 157140042
Bidens polylepis, photographed by Matt Pelikan
fig. d Matt Pelikan, CC BY 4.0 / obs. 156431748
Bidens polylepis, photographed by Tom Field
fig. e Tom Field, CC BY 4.0 / obs. 96799237
Bidens polylepis, photographed by Thomas Koffel
fig. f Thomas Koffel, CC BY 4.0 / obs. 96354746
Bidens polylepis, photographed by Thomas Koffel
fig. g Thomas Koffel, CC BY 4.0 / obs. 94888487
Bidens polylepis, photographed by Thomas Koffel
fig. h Thomas Koffel, CC BY 4.0 / obs. 93643490

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 22 botanical countries

Regions where Bidens polylepis is native: Alabama, Arkansas, Colorado, Illinois, Indiana, Iowa, Kansas, Louisiana, Maryland, Michigan, Missouri, Nebraska, New Jersey, New Mexico, North Carolina, Oklahoma, Ontario, Pennsylvania, South Carolina, Tennessee, Texas, Virginia AlabamaArkansasColoradoIllinoisIndianaIowaKansasLouisianaMarylandMichiganMissouriNebraskaNew JerseyNew MexicoNorth CarolinaOklahomaOntarioPennsylvaniaSouth CarolinaTennesseeTexasVirginia
Native distribution of Bidens polylepis, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Alabama ALA NORTHERN AMERICA
Arkansas ARK
Colorado COL
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Louisiana LOU
Maryland MRY
Michigan MIC
Missouri MSO
Nebraska NEB
New Jersey NWJ
New Mexico NWM
North Carolina NCA
Oklahoma OKL
Ontario ONT
Pennsylvania PEN
South Carolina SCA
Tennessee TEN
Texas TEX
Virginia VRG

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 121 in flower of 123 examined

Peak flowering in Aug. Each bar is the share of Bidens polylepis observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 121 of 123 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 9 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 7 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Bidens aristosa f. involucrata (Nutt.) Wunderlin
  • Bidens involucrata (Nutt.) Britton
  • Bidens involucrata var. involucrata
  • Bidens involucrata var. retrorsa Sherff
  • Bidens polylepis var. polylepis
  • Coreopsis involucrata Nutt.
  • Diodonta involucrata Nutt.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.