Senecio callosus

Plate 1 figs. a–h · 8 separate observations

Senecio callosus, photographed by Juan Carlos Fonseca Mata — fig. b Juan Carlos Fonseca Mata, CC BY 4.0 / obs. 179444420

Senecio callosus, photographed by Jean-Paul Boerekamps — fig. c Jean-Paul Boerekamps, CC0 1.0 / obs. 96897816

Senecio callosus, photographed by Eric Knight — fig. d Eric Knight, CC BY 4.0 / obs. 29361652

Senecio callosus, photographed by Peter Abrahamsen — fig. e Peter Abrahamsen, CC BY 4.0 / obs. 167592348

Senecio callosus, photographed by Neptalí Ramírez Marcial — fig. f Neptalí Ramírez Marcial, CC BY 4.0 / obs. 29161956

Senecio callosus, photographed by Jose Enrique — fig. g Jose Enrique, CC BY 4.0 / obs. 112941167

Senecio callosus, photographed by Will Cornwell — fig. h Will Cornwell, CC BY 4.0 / obs. 59148461

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.

Native range 6 botanical countries

Native distribution of Senecio callosus, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.

Region	TDWG code	Continent
Mexico Central	MXC	NORTHERN AMERICA
Mexico Gulf	MXG
Mexico Northeast	MXE
Mexico Southeast	MXT
Mexico Southwest	MXS
Guatemala	GUA	SOUTHERN AMERICA

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 391 in flower of 475 examined

90%

95%

52%

45%

22%

63%

69%

75%

82%

Proportion of examined Senecio callosus in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	92	102	90%	83% to 95%
Feb	126	133	95%	90% to 97%
Mar	56	59	95%	86% to 98%
Apr	12	23	52%	33% to 71%
May	5	11	45%	21% to 72%
Jun	0	8	0%	0% to 32%
Jul	2	9	22%	6% to 55%
Aug	2	4	too few examined
Sep	5	8	63%	31% to 86%
Oct	22	32	69%	51% to 82%
Nov	18	24	75%	55% to 88%
Dec	51	62	82%	71% to 90%

Peak flowering in Mar. Each bar is the share of Senecio callosus 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. 391 of 475 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. 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.

Where it actually grows measured, from 609 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-2.0 °C	0.7 °C	4.4 °C
Warmest month, mean daily high	17.4 °C	19.8 °C	23.3 °C
Annual rainfall	878 mm	1,340 mm	1,591 mm
Rainfall in the driest quarter	28 mm	50 mm	68 mm

It is found where winters bring light frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 609 research-grade observations of Senecio callosus that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

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.

Cacalia toluccana DC.
Senecio decorus Greenm.

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.
Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

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.