Packera werneriifolia (hoary groundsel)

Plate 1 figs. a–h · 8 separate observations

Packera werneriifolia, photographed by Martin Purdy — fig. a Martin Purdy, CC BY 4.0 / 2022-06-11 / obs. 205298202

Packera werneriifolia, photographed by Lauren McLaurin — fig. b Lauren McLaurin, CC BY 4.0 / obs. 47176775

Packera werneriifolia, photographed by Ken-ichi Ueda — fig. c Ken-ichi Ueda, CC BY 4.0 / obs. 47307176

Packera werneriifolia, photographed by Trystan Harpold — fig. d Trystan Harpold, CC BY 4.0 / obs. 43473156

Packera werneriifolia, photographed by Tim Messick — fig. f Tim Messick, CC BY 4.0 / obs. 101820614

Packera werneriifolia, photographed by Jim Morefield — fig. g Jim Morefield, CC BY 4.0 / obs. 17395503

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 35 in flower of 38 examined

100%

92%

Proportion of examined Packera werneriifolia in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	0	0	too few examined
Apr	0	0	too few examined
May	4	4	too few examined
Jun	15	15	100%	80% to 100%
Jul	12	13	92%	67% to 99%
Aug	3	3	too few examined
Sep	1	2	too few examined
Oct	0	1	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Jun. Each bar is the share of Packera werneriifolia 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. 35 of 38 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 10 months have fewer than 5 examined observations, so no proportion is drawn for them. 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 14 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.

Packera werneriifolia var. werneriifolia
Senecio alpicola Rydb.
Senecio aureus var. werneriifolius A.Gray
Senecio molinarius Greenm.
Senecio muirii Greenm.
Senecio perennans A.Nelson
Senecio petraeus Klatt
Senecio petrophilus Greene
Senecio pterocaulis Greenm.
Senecio saxosus Klatt
Senecio saxosus var. saxosus
Senecio scaposus A.Nelson
Senecio werneriifolius (A.Gray) A.Gray
Senecio werneriifolius var. werneriifolius

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.