Erechtites valerianifolius (tropical burnweed)

Plate 1 figs. a–h · 8 separate observations

Erechtites valerianifolius, photographed by Greg Tasney — fig. a Greg Tasney, CC BY-SA 4.0 / 2022-06-13 / obs. 205711842

Erechtites valerianifolius, photographed by Don Loarie — fig. b Don Loarie, CC BY 4.0 / obs. 203245922

Erechtites valerianifolius, photographed by Tyler Bishop — fig. c Tyler Bishop, CC BY 4.0 / obs. 198425091

Erechtites valerianifolius, photographed by Thomas Mesaglio — fig. d Thomas Mesaglio, CC BY 4.0 / obs. 175781111

Erechtites valerianifolius, photographed by Álvaro Rivas Godin — fig. f Álvaro Rivas Godin, CC BY 4.0 / obs. 167553324

Erechtites valerianifolius, photographed by Kevin Faccenda — fig. g Kevin Faccenda, CC BY 4.0 / obs. 165886038

Erechtites valerianifolius, photographed by Andrés Ramírez-Barrera — fig. h Andrés Ramírez-Barrera, CC BY 4.0 / obs. 142491602

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 220 in flower of 363 examined

82%

77%

58%

82%

56%

77%

80%

41%

46%

58%

43%

27%

Proportion of examined Erechtites valerianifolius in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	28	34	82%	66% to 92%
Feb	23	30	77%	59% to 88%
Mar	15	26	58%	39% to 74%
Apr	36	44	82%	68% to 90%
May	22	39	56%	41% to 71%
Jun	23	30	77%	59% to 88%
Jul	12	15	80%	55% to 93%
Aug	12	29	41%	26% to 59%
Sep	11	24	46%	28% to 65%
Oct	14	24	58%	39% to 76%
Nov	15	35	43%	28% to 59%
Dec	9	33	27%	15% to 44%

Peak flowering in Jan. Each bar is the share of Erechtites valerianifolius observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 220 of 363 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 13 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.

Crassocephalum valerianifolium (Link ex Wolf) Less.
Erechtites ambiguus DC.
Erechtites organensis Gardner
Erechtites valerianifolia f. depauperata Hochr.
Eupatorium angosturae Pol.
Gynura rosea Ridl.
Senecio crassus Vell.
Senecio paludicola Steud.
Senecio palustris Vell.
Senecio valerianifolius Link ex Spreng.
Senecio valerianifolius Gardner
Senecio valerianifolius Desf.
Senecio valerianifolius Rchb.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite. It has no native range either: Kew's checklist does not cover this taxon.