Sisymbrium irioL.

London rocket

WFO wfo-0000431928 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Sisymbrium irio, photographed by Daniel Cahen
fig. a Daniel Cahen, CC BY 4.0 / 2022-04-18 / obs. 189025065
Sisymbrium irio, photographed by Millie Basden
fig. b Millie Basden, CC BY 4.0 / obs. 189135700
Sisymbrium irio, photographed by Josep Gesti
fig. c Josep Gesti, CC BY-SA 4.0 / obs. 192949902
Sisymbrium irio, photographed by Cricket Raspet
fig. d Cricket Raspet, CC BY 4.0 / obs. 188944771
Sisymbrium irio, photographed by Andrew Meeds
fig. e Andrew Meeds, CC BY 4.0 / obs. 186073187
Sisymbrium irio, photographed by Daniel Cahen
fig. f Daniel Cahen, CC BY 4.0 / obs. 188238948
Sisymbrium irio, photographed by Vasily Reinkymov
fig. g Vasily Reinkymov, CC0 1.0 / obs. 183857742
Sisymbrium irio, photographed by joergmlpts
fig. h joergmlpts, CC BY 4.0 / obs. 182522921

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.

Flowering n = 1,850 observations

Peak flowering in Mar, from 1,850 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 22 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.

  • Arabis charbonnelii H.Lév.
  • Crucifera irio E.H.L.Krause
  • Descurainia irio Webb & Berthel.
  • Erysimum irio (L.) Rupr.
  • Erysimum irio (L.) Farw.
  • Hesperis iriodes Kuntze
  • Hesperis maxima Kuntze
  • Hesperis subulata Kuntze
  • Irio ruderalis Fourr.
  • Norta irio Britton
  • Phryne laxata Bubani
  • Sisymbrium erysimastrum Lam.
  • Sisymbrium filiforme Dulac
  • Sisymbrium glabrum Willd.
  • Sisymbrium irio var. dasycarpum O.E.Schulz
  • Sisymbrium irio var. leiocarpum Maire
  • Sisymbrium irioides Boiss.
  • Sisymbrium latifolium Gray
  • Sisymbrium maximum Hochst. ex E.Fourn.
  • Sisymbrium multisiliquosum Hoffm.
  • Sisymbrium pinnatifidum Forssk.
  • Sisymbrium subulatum E.Fourn.

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.

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