Eryngium yuccifoliumMichx.

rattlesnake master

WFO wfo-0000678333 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Eryngium yuccifolium, photographed by Ryan Sorrells
fig. a Ryan Sorrells, CC BY 4.0 / 2022-05-22 / obs. 199900187
Eryngium yuccifolium, photographed by Thomas Koffel
fig. b Thomas Koffel, CC BY 4.0 / obs. 204527049
Eryngium yuccifolium, photographed by Yann Kemper
fig. c Yann Kemper, CC0 1.0 / obs. 192532857
Eryngium yuccifolium, photographed by Samuel A Schmid, PhD, PWS
fig. d Samuel A Schmid, PhD, PWS, CC BY 4.0 / obs. 205624197
Eryngium yuccifolium, photographed by Thomas Koffel
fig. e Thomas Koffel, CC BY 4.0 / obs. 188906497
Eryngium yuccifolium, photographed by Yann Kemper
fig. f Yann Kemper, CC0 1.0 / obs. 192533442
Eryngium yuccifolium, photographed by Yann Kemper
fig. g Yann Kemper, CC0 1.0 / obs. 192549207
Eryngium yuccifolium, photographed by Thomas Koffel
fig. h Thomas Koffel, CC BY 4.0 / obs. 188895216

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 = 959 observations

Peak flowering in Jul, from 959 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 2 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.

  • Eryngium aquaticum var. synchaetum (A.Gray ex J.M.Coult. & Rose) H.Wolff
  • Eryngium synchaetum (A.Gray ex J.M.Coult. & Rose) J.M.Coult. & Rose

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.