Cynanchum thesioides(Freyn) K.Schum.

WFO wfo-0000633662 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Cynanchum thesioides, photographed by Zinogre
fig. a Zinogre, CC BY-SA 4.0 / 2021-11-03 / obs. 167378179
Cynanchum thesioides, photographed by Oleg Kosterin
fig. b Oleg Kosterin, CC BY 4.0 / obs. 151384239
Cynanchum thesioides, photographed by Татьяна Фирсова
fig. c Татьяна Фирсова, CC0 1.0 / obs. 141807396
Cynanchum thesioides, photographed by Alexander Dubynin
fig. d Alexander Dubynin, CC BY 4.0 / obs. 107711364
Cynanchum thesioides, photographed by Andrew Bazdyrev
fig. e Andrew Bazdyrev, CC BY 4.0 / obs. 112611212
Cynanchum thesioides, photographed by Oleg Kosterin
fig. f Oleg Kosterin, CC BY 4.0 / obs. 167367923
Cynanchum thesioides, photographed by Zinogre
fig. g Zinogre, CC BY-SA 4.0 / obs. 190817709
Cynanchum thesioides, photographed by Вячеслав Пискарев
fig. h Вячеслав Пискарев, CC BY 4.0 / obs. 147276467

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 17 botanical countries

Regions where Cynanchum thesioides is native: Altay, Amur, Buryatiya, China North-Central, China Southeast, Chita, Inner Mongolia, Irkutsk, Kazakhstan, Korea, Krasnoyarsk, Manchuria, Mongolia, Primorye, Tuva, West Siberia, Xinjiang AltayAmurBuryatiyaChina North-CentralChina SoutheastChitaInner MongoliaIrkutskKazakhstanKrasnoyarskManchuriaMongoliaPrimoryeTuvaWest SiberiaXinjiang Korea
Native distribution of Cynanchum thesioides, 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. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Altay ALT ASIA-TEMPERATE
Amur AMU
Buryatiya BRY
China North-Central CHN
China Southeast CHS
Chita CTA
Inner Mongolia CHI
Irkutsk IRK
Kazakhstan KAZ
Korea KOR
Krasnoyarsk KRA
Manchuria CHM
Mongolia MON
Primorye PRM
Tuva TVA
West Siberia WSB
Xinjiang CHX

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 31 in flower of 43 examined

Peak flowering in Jun. Each bar is the share of Cynanchum thesioides 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. 31 of 43 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 26 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 sibiricum (L.) Pobed.
  • Antitoxicum lanceolatum Grubov
  • Antitoxicum sibiricum (L.) Pobed.
  • Asclepias sibirica L.
  • Cynanchum gobicum Grubov
  • Cynanchum sibiricum (L.) R.Br.
  • Cynanchum sibiricum f. hypopsilum Nakai & Kitag.
  • Cynanchum sibiricum f. latifolium (Kitag.) Kitag.
  • Cynanchum sibiricum var. australe (Maxim.) Maxim. ex Kom.
  • Cynanchum sibiricum var. boreale (Maxim.) Kom.
  • Cynanchum sibiricum var. gracilentum Nakai & Kitag.
  • Cynanchum sibiricum var. latifolium Kitag.
  • Cynanchum sibiricum var. thesioides (Freyn) Kom.
  • Cynanchum thesioides var. australe (Maxim.) Y.Tsiang & P.T.Li
  • Cynanchum thesioides var. thesioides
  • Rhodostegiella sibirica (L.) C.Y.Wu & D.Z.Li
  • Rhodostegiella sibirica var. australis (Maxim.) C.Y.Wu & D.Z.Li
  • Vincetoxicum lanceolatum (Grubov) Grubov
  • Vincetoxicum sibiricum (L.) Decne.
  • Vincetoxicum sibiricum f. hypopsilum (Kitag.) Kitag.
  • Vincetoxicum sibiricum f. latifolium (Kitag.) Kitag.
  • Vincetoxicum sibiricum f. linearifolium Debeaux
  • Vincetoxicum sibiricum var. australe Maxim.
  • Vincetoxicum sibiricum var. boreale Maxim.

and 2 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. 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.