Cirsium serrulatum

Plate 1 figs. a–h · 8 separate observations

Cirsium serrulatum, photographed by Konstantin Grebennikov — fig. e Konstantin Grebennikov, CC BY 4.0 / obs. 143107275

Cirsium serrulatum, photographed by Юрий Данилевский (Yuriy Danilevsky) — fig. f Юрий Данилевский (Yuriy Danilevsky), CC BY 4.0 / obs. 97908745

Cirsium serrulatum, photographed by Älven — fig. g Älven, CC0 1.0 / obs. 53477191

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 9 botanical countries

Native distribution of Cirsium serrulatum, 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
Central European Russia	RUC	EUROPE
East European Russia	RUE
Krym	KRY
Romania	ROM
South European Russia	RUS
Ukraine	UKR
Altay	ALT	ASIA-TEMPERATE
Kazakhstan	KAZ
North Caucasus	NCS

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 39 in flower of 58 examined

75%

74%

Proportion of examined Cirsium serrulatum in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	0	0	too few examined
Mar	0	0	too few examined
Apr	0	0	too few examined
May	0	3	too few examined
Jun	0	2	too few examined
Jul	21	28	75%	57% to 87%
Aug	14	19	74%	51% to 88%
Sep	3	3	too few examined
Oct	1	2	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Jul. Each bar is the share of Cirsium serrulatum 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. 39 of 58 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 4 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.

Carduus serrulatus (M.Bieb.) Steud.
Cirsium ciliatoaffine Besser
Cnicus serrulatus M.Bieb.
Epitrachys serrulata (M.Bieb.) K.Koch

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.