Erythranthe cardinalis(Douglas ex Benth.) Spach

scarlet monkeyflower

WFO wfo-0000679504 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Erythranthe cardinalis, photographed by George Williams
fig. a George Williams, CC BY 4.0 / 2022-05-22 / obs. 199868024
Erythranthe cardinalis, photographed by George Williams
fig. b George Williams, CC BY 4.0 / obs. 160770874
Erythranthe cardinalis, photographed by velodrome
fig. c velodrome, CC BY 4.0 / obs. 170154360
Erythranthe cardinalis, photographed by Drew Meyer
fig. d Drew Meyer, CC0 1.0 / obs. 202897974
Erythranthe cardinalis, photographed by Dan Horowitz
fig. e Dan Horowitz, CC0 1.0 / obs. 168456066
Erythranthe cardinalis, photographed by George Williams
fig. f George Williams, CC BY 4.0 / obs. 164860777
Erythranthe cardinalis, photographed by Stella
fig. g Stella, CC BY 4.0 / obs. 158288047
Erythranthe cardinalis, photographed by Tim Messick
fig. h Tim Messick, CC BY 4.0 / obs. 161140632

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 = 2,167 observations

Peak flowering in Jul, from 2,167 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 8 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.

  • Diplacus cardinalis (Douglas ex Benth.) Groenland
  • Mimulus cardinalis Douglas ex Benth.
  • Mimulus cardinalis var. exsul Greene
  • Mimulus cardinalis var. griseus Greene
  • Mimulus cardinalis var. rigens Greene
  • Mimulus maclaineanus Paxton
  • Mimulus maclainii Ferguson ex Hook.
  • Mimulus rubina Ysabeau

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.