Quercus glaucaThunb.

ring-cup oak

WFO wfo-0000290946 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Quercus glauca, photographed by 岸本年郎
fig. a 岸本年郎, CC BY 4.0 / 2022-04-10 / obs. 187362347
Quercus glauca, photographed by 葉子
fig. b 葉子, CC0 1.0 / obs. 179904160
Quercus glauca, photographed by Marco Mussita
fig. c Marco Mussita, CC BY 4.0 / obs. 178847408
Quercus glauca, photographed by Marco Mussita
fig. d Marco Mussita, CC BY 4.0 / obs. 171740114
Quercus glauca, photographed by Se Lena
fig. e Se Lena, CC BY 4.0 / obs. 167722757
Quercus glauca, photographed by Se Lena
fig. f Se Lena, CC BY 4.0 / obs. 167550193
Quercus glauca, photographed by 葉子
fig. g 葉子, CC0 1.0 / obs. 122711474
Quercus glauca, photographed by 葉子
fig. h 葉子, CC0 1.0 / obs. 122711159

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 16 botanical countries

Regions where Quercus glauca is native: China North-Central, China South-Central, China Southeast, Hainan, Japan, Korea, Nansei-shoto, Taiwan, Tibet, Assam, East Himalaya, Laos, Myanmar, Nepal, Vietnam, West Himalaya China North-CentralChina South-CentralChina SoutheastHainanJapanTaiwanTibetAssamEast HimalayaLaosMyanmarNepalVietnamWest Himalaya KoreaNansei-shoto
Native distribution of Quercus glauca, 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
China North-Central CHN ASIA-TEMPERATE
China South-Central CHC
China Southeast CHS
Hainan CHH
Japan JAP
Korea KOR
Nansei-shoto NNS
Taiwan TAI
Tibet CHT
Assam ASS ASIA-TROPICAL
East Himalaya EHM
Laos LAO
Myanmar MYA
Nepal NEP
Vietnam VIE
West Himalaya WHM

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.

Also published as 44 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.

  • Cyclobalanopsis amamiana (Hatus.) Masam.
  • Cyclobalanopsis glauca Oerst.
  • Cyclobalanopsis glauca f. latifolia (Nakai) Hiyama ex Sugim.
  • Cyclobalanopsis glauca var. elongata (Honda) Sugim.
  • Cyclobalanopsis glauca var. kuyuensis (J.C.Liao) J.C.Liao
  • Cyclobalanopsis glauca var. lacera (Blume) Sugim.
  • Cyclobalanopsis glauca var. latifolia Nakai
  • Cyclobalanopsis glauca var. linearifolia (Koidz.) Sugim.
  • Cyclobalanopsis glauca var. stricta (Makino) Sugim.
  • Cyclobalanopsis globosa Lin & T.Liu
  • Cyclobalanopsis repandifolia (J.C.Liao) J.C.Liao
  • Cyclobalanopsis sasakii (Kaneh.) Kudô & Masam.
  • Cyclobalanopsis vibrayana (Franch. & Sav.) Schottky
  • Perytis glauca Raf.
  • Quercus acuta var. bambusifolia G.Nicholson
  • Quercus amamiana Hatus.
  • Quercus bambusifolia Fortune
  • Quercus blakei var. vaniotii (H.Lév.) Chun
  • Quercus dentosa Lindl.
  • Quercus glauca f. lacera (Blume) Kitam.
  • Quercus glauca subsp. euglauca A.Camus
  • Quercus glauca var. amamiana (Hatus.) Hatus. ex H.Ohba
  • Quercus glauca var. amamiana (Hatus.) Hatus.
  • Quercus glauca var. caesia Blume

and 20 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. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. 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.