Trichostema dichotomumL.

Blue Curls

WFO wfo-0000327910 Accepted WFO 2026-06 7 photographs CC0 / CC BY

Plate 1 figs. a–g

Trichostema dichotomum, photographed by Lynn Harper
fig. a Lynn Harper, CC0 1.0 / 2022-02-17 / obs. 179760652
Trichostema dichotomum, photographed by Lynn Harper
fig. b Lynn Harper, CC0 1.0 / obs. 192146274
Trichostema dichotomum, photographed by Annika Lindqvist
fig. c Annika Lindqvist, CC BY 4.0 / obs. 167357936
Trichostema dichotomum, photographed by Violet T.
fig. d Violet T., CC BY 4.0 / obs. 175650960
Trichostema dichotomum, photographed by Michelle W. （鍾偉瑋）
fig. e Michelle W. （鍾偉瑋）, CC BY 4.0 / obs. 163005455
Trichostema dichotomum, photographed by Ryan Watson
fig. f Ryan Watson, CC BY 4.0 / obs. 162477138
Trichostema dichotomum, photographed by Annika Lindqvist
fig. g Annika Lindqvist, CC BY 4.0 / obs. 162170056

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 = 1,814 observations

Peak flowering in Sep, from 1,814 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.

  • Trichostema dichotomum var. puberulum Fernald & Griscom
  • Trichostema pilosum Roth

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.