Silaum silaus (pepper saxifrage)

Plate 1 figs. a–h · 8 separate observations

Silaum silaus, photographed by Yurii Basov — fig. a Yurii Basov, CC BY 4.0 / 2022-05-27 / obs. 200992124

Silaum silaus, photographed by Tim Johnson — fig. c Tim Johnson, CC BY 4.0 / obs. 175733655

Silaum silaus, photographed by Aleksei Baushev — fig. d Aleksei Baushev, CC BY 4.0 / obs. 150735418

Silaum silaus, photographed by Björn Sothmann — fig. h Björn Sothmann, CC BY-SA 4.0 / obs. 88937895

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 43 in flower of 62 examined

100%

71%

86%

50%

Proportion of examined Silaum silaus 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	3	too few examined
May	0	4	too few examined
Jun	8	8	100%	68% to 100%
Jul	10	14	71%	45% to 88%
Aug	19	22	86%	67% to 95%
Sep	4	8	50%	22% to 78%
Oct	2	3	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 Silaum silaus 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. 43 of 62 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 8 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 47 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.

Cnidium pratense (Crantz) Bubani
Cnidium silaus M.Bieb.
Cnidium silaus (L.) Spreng.
Cnidium silaus var. angustifolium Wallr.
Cnidium silaus var. latifolium Wallr.
Crithmum silaus (L.) Wibel
Ligusticum alpestre Calest.
Ligusticum arenarium Link
Ligusticum silaus (L.) Vill.
Meum sibiricum Spreng.
Meum silaus (L.) Baill.
Peucedanum album hort. ex Hoffm.
Peucedanum album Spreng.
Peucedanum alpestre L.
Peucedanum arenarium Spreng.
Peucedanum flavum Salisb.
Peucedanum matthioli Spreng.
Peucedanum pratense (Crantz) Lam.
Peucedanum serotinum Pers.
Peucedanum silaus L.
Peucedanum silaus-officinale Liebl.
Peucedanum tenuifolium Poir.
Peucedanum trilobatum Gilib.
Saxifraga magna Garsault

and 23 more.

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.