Crepis biennisL.

rough hawksbeard

WFO wfo-0000106204 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Crepis biennis, photographed by Pavel Kacl
fig. a Pavel Kacl, CC BY 4.0 / 2022-06-11 / obs. 205534581
Crepis biennis, photographed by Petr Harant
fig. b Petr Harant, CC BY 4.0 / obs. 202885870
Crepis biennis, photographed by Elias
fig. c Elias, CC BY 4.0 / obs. 197535104
Crepis biennis, photographed by thomas_oswald
fig. d thomas_oswald, CC BY 4.0 / obs. 194242115
Crepis biennis, photographed by Vladimír Fuka
fig. e Vladimír Fuka, CC BY 4.0 / obs. 156714822
Crepis biennis, photographed by Pavel Kacl
fig. f Pavel Kacl, CC BY 4.0 / obs. 155315016
Crepis biennis, photographed by Dmitriy Bochkov
fig. g Dmitriy Bochkov, CC BY 4.0 / obs. 151963984
Crepis biennis, photographed by Pavel Kacl
fig. h Pavel Kacl, CC BY 4.0 / obs. 150951312

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.

The specimen a real sheet, in a real collection

Herbarium
The New York Botanical Garden
Accession
02068197
Filed as
Crepis biennis L.
Det. by
not recorded on this sheet
Collected
E. P. Bicknell 1913-06-12
Origin
US
The sheet
View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 30 botanical countries

Regions where Crepis biennis is native: Albania, Austria, Baltic States, Belarus, Belgium, Bulgaria, Central European Russia, Czechia-Slovakia, Denmark, East European Russia, Finland, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Netherlands, North European Russia, Northwest European Russia, Norway, NW. Balkan Pen., Poland, Romania, Sardegna, Spain, Sweden, Switzerland, Ukraine AlbaniaAustriaBaltic StatesBelarusBelgiumBulgariaCentral European RussiaCzechia-SlovakiaDenmarkEast European RussiaFinlandFranceGermanyGreeceHungaryIrelandItalyNetherlandsNorth European RussiaNorthwest European RussiaNorwayNW. Balkan Pen.PolandRomaniaSpainSwedenSwitzerlandUkraine Sardegna
Native distribution of Crepis biennis, 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. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Albania ALB EUROPE
Austria AUT
Baltic States BLT
Belarus BLR
Belgium BGM
Bulgaria BUL
Central European Russia RUC
Czechia-Slovakia CZE
Denmark DEN
East European Russia RUE
Finland FIN
France FRA
Germany GER
Great Britain GRB
Greece GRC
Hungary HUN
Ireland IRE
Italy ITA
Netherlands NET
North European Russia RUN
Northwest European Russia RUW
Norway NOR
NW. Balkan Pen. YUG
Poland POL
Romania ROM
Sardegna SAR
Spain SPA
Sweden SWE
Switzerland SWI
Ukraine UKR

Not drawn on the map: Great Britain. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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 184 in flower of 215 examined

Peak flowering in Oct. Each bar is the share of Crepis biennis 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. 184 of 215 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 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.

Where it actually grows measured, from 1,996 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -10.8 °C -4.2 °C -0.2 °C
Warmest month, mean daily high 20.1 °C 22.9 °C 25.5 °C
Annual rainfall 570 mm 785 mm 1,463 mm
Rainfall in the driest quarter 87 mm 131 mm 282 mm

It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 1,996 research-grade observations of Crepis biennis that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 44 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.

  • Barkhausia pinguis Rchb.
  • Brachyderea biennis Sch.Bip.
  • Brachyderea biennis (L.) F.W.Schultz
  • Crepis biennis subsp. subalpina (Nyár.) Nyár.
  • Crepis biennis var. alpestris Beauverd
  • Crepis biennis var. banatica Rochel
  • Crepis biennis var. calcarea (Wender.) Wigand & F.Meigen
  • Crepis biennis var. carpatica Popov
  • Crepis biennis var. dentata W.D.J.Koch
  • Crepis biennis var. dentata Wimm. & Grab.
  • Crepis biennis var. glabrescens Schur
  • Crepis biennis var. glandulosopilosa Heuff.
  • Crepis biennis var. hispida Woerl. ex Beger
  • Crepis biennis var. humilis Schur
  • Crepis biennis var. lacera Wimm. & Grab.
  • Crepis biennis var. leptophylla Wallr.
  • Crepis biennis var. lorifolia Beck
  • Crepis biennis var. maritima Corb.
  • Crepis biennis var. minoriceps Murr
  • Crepis biennis var. nitens Nyár.
  • Crepis biennis var. platyphylla Wallr.
  • Crepis biennis var. pubescens Beckh.
  • Crepis biennis var. runcinata Wimm. & Grab.
  • Crepis biennis var. scabriuscula Schur

and 20 more.

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. USDA PLANTS Database. common name, checklist symbol CRBI3. public domain. Retrieved 2026-07-13.
  4. 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.