Vincetoxicum rossicum (European swallow-wort)

Plate 1 figs. a–h · 8 separate observations

Vincetoxicum rossicum, photographed by rboles — fig. a rboles, CC BY 4.0 / 2022-06-09 / obs. 204779515

Vincetoxicum rossicum, photographed by Randy A Nonenmacher — fig. b Randy A Nonenmacher, CC BY 4.0 / obs. 202525079

Vincetoxicum rossicum, photographed by Larry Jensen — fig. d Larry Jensen, CC BY 4.0 / obs. 146480896

Vincetoxicum rossicum, photographed by Andrew Sebastian — fig. e Andrew Sebastian, CC BY 4.0 / obs. 144967846

Vincetoxicum rossicum, photographed by Kalvin Chan — fig. f Kalvin Chan, CC BY 4.0 / obs. 139662905

Vincetoxicum rossicum, photographed by Henry "Nick" Robertson — fig. g Henry "Nick" Robertson, CC BY-SA 4.0 / obs. 138633266

Vincetoxicum rossicum, photographed by Zac Peterson — fig. h Zac Peterson, CC BY 4.0 / obs. 134254526

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 4 botanical countries

Native distribution of Vincetoxicum rossicum, 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
South European Russia	RUS
Ukraine	UKR

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 2,273 in flower of 5,880 examined

33%

77%

35%

13%

Proportion of examined Vincetoxicum rossicum in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	69	0%	0% to 5%
Feb	0	74	0%	0% to 5%
Mar	0	83	0%	0% to 4%
Apr	0	131	0%	0% to 3%
May	230	707	33%	29% to 36%
Jun	1566	2039	77%	75% to 79%
Jul	358	1010	35%	33% to 38%
Aug	109	816	13%	11% to 16%
Sep	10	561	2%	1% to 3%
Oct	0	223	0%	0% to 2%
Nov	0	109	0%	0% to 3%
Dec	0	58	0%	0% to 6%

Peak flowering in Jun. Each bar is the share of Vincetoxicum rossicum 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. 2,273 of 5,880 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 7 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.

Alexitoxicon rosaicum (Kleopow) Pobed.
Alexitoxicon rossicum (Kleopow) Pobed.
Antitoxicum rossicum (Kleopow) Pobed.
Cynanchum melanthos Poir.
Cynanchum rossicum Borhidi
Cynanchum rossicum Kleopow
Vincetoxicum officinale var. rossicum (Kleopow) Grodz.

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.
USDA PLANTS Database. common name, checklist symbol CYRO8. public domain. Retrieved 2026-07-13.
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.