Hieracium venosumL.

rattlesnakeweed

WFO wfo-0000044395 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Hieracium venosum, photographed by Clay Gibbons
fig. a Clay Gibbons, CC BY 4.0 / 2022-06-11 / obs. 205260602
Hieracium venosum, photographed by Gus
fig. b Gus, CC BY-SA 4.0 / obs. 204407635
Hieracium venosum, photographed by Clay Gibbons
fig. c Clay Gibbons, CC BY 4.0 / obs. 200853420
Hieracium venosum, photographed by Ben Smith
fig. d Ben Smith, CC BY 4.0 / obs. 201422380
Hieracium venosum, photographed by skitterbug
fig. e skitterbug, CC BY 4.0 / obs. 248970378
Hieracium venosum, photographed by Wendy Jegla
fig. f Wendy Jegla, CC BY 4.0 / obs. 202717953
Hieracium venosum, photographed by Liz Rifenburg
fig. g Liz Rifenburg, CC0 1.0 / obs. 203910248
Hieracium venosum, photographed by Lynn Harper
fig. h Lynn Harper, CC0 1.0 / obs. 200308304

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.

Confused withby our own model

These are not lookalikes we guessed at. Each one is a species our identification model genuinely mistook for this plant, and how many times. The error rate is published.

Flowering n = 647 observations

Peak flowering in May, from 647 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 3 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.

  • Hieracium gronovii var. nudicaule Michx.
  • Hieracium venosum var. nudicaule (Michx.) Farw.
  • Stenotheca venosa (L.) Monnier

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.