Lepidium didymumL.

swinecresswartcresslesser swinecress

WFO wfo-0000358253 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Lepidium didymum, photographed by Leila Dasher
fig. a Leila Dasher, CC BY 4.0 / 2022-06-12 / obs. 205643572
Lepidium didymum, photographed by Daniel Cahen
fig. b Daniel Cahen, CC BY 4.0 / obs. 205522883
Lepidium didymum, photographed by Piermario Maculan
fig. c Piermario Maculan, CC0 1.0 / obs. 205253579
Lepidium didymum, photographed by Daniel Cahen
fig. d Daniel Cahen, CC BY 4.0 / obs. 203369736
Lepidium didymum, photographed by Munster Mad
fig. e Munster Mad, CC0 1.0 / obs. 202785751
Lepidium didymum, photographed by Daniel Cahen
fig. f Daniel Cahen, CC BY 4.0 / obs. 202821570
Lepidium didymum, photographed by Daniel Cahen
fig. g Daniel Cahen, CC BY 4.0 / obs. 199792442
Lepidium didymum, photographed by Daniel Cahen
fig. h Daniel Cahen, CC BY 4.0 / obs. 199795426

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 14 botanical countries

Regions where Lepidium didymum is native: Falkland Is., Argentina Northeast, Argentina Northwest, Argentina South, Bolivia, Brazil Northeast, Brazil South, Brazil Southeast, Chile Central, Chile North, Chile South, Paraguay, Peru, Uruguay Falkland Is.Argentina NortheastArgentina NorthwestArgentina SouthBoliviaBrazil NortheastBrazil SouthBrazil SoutheastChile CentralChile NorthChile SouthParaguayPeruUruguay
Native distribution of Lepidium didymum, 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
Argentina Northeast AGE SOUTHERN AMERICA
Argentina Northwest AGW
Argentina South AGS
Bolivia BOL
Brazil Northeast BZE
Brazil South BZS
Brazil Southeast BZL
Chile Central CLC
Chile North CLN
Chile South CLS
Paraguay PAR
Peru PER
Uruguay URU
Falkland Is. FAL ANTARCTICA

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 377 in flower of 749 examined

Peak flowering in Oct. Each bar is the share of Lepidium didymum 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. 377 of 749 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 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 33 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.

  • Biscutella apetala Walter
  • Carara didyma Britton
  • Cochlearia humifusa Michx.
  • Coronopus didymus (L.) Sm.
  • Coronopus didymus f. incisus (Willd.) Muschl.
  • Coronopus didymus f. pectinatus Muschl.
  • Coronopus didymus var. incisa (Willd.) Hook.f.
  • Coronopus didymus var. macrocarpus Muschl.
  • Coronopus didymus var. rosulatus Muschl.
  • Coronopus heleniana (DC.) Spreng.
  • Coronopus incisus Hornem.
  • Coronopus leptocarpus Boelcke
  • Coronopus leptocarpus var. leptocarpus Boelcke
  • Coronopus leptocarpus var. microcarpus Boelcke
  • Coronopus pectinatus (DC.) Kuntze
  • Coronopus pinnatifidus F.Meigen
  • Coronopus pinnatifidus Dulac
  • Coronopus pinnatus Hornem.
  • Crucifera senebiera E.H.L.Krause
  • Eudistemon humifusum Raf.
  • Lepicochlea americana Rojas Acosta
  • Lepidium americanum Vell.
  • Lepidium anglicum Huds.
  • Lepidium prostratum Savi

and 9 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. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. 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.