Plate 1 figs. a–h · 8 separate observations
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 92 botanical countries
Not drawn on the map: Kuril Is., Great Britain. We hold no public-domain boundary for these regions, so they are listed rather than guessed at.
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.
Where it actually grows measured, from 526 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -24.2 °C | -11.8 °C | -4.1 °C |
| Warmest month, mean daily high | 17.6 °C | 22.9 °C | 26.1 °C |
| Annual rainfall | 455 mm | 880 mm | 1,478 mm |
| Rainfall in the driest quarter | 49 mm | 145 mm | 306 mm |
It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 526 research-grade observations of Carex diandra that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.
This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.
Also published as 29 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.
- Carex bernardina Parish
- Carex diandra f. conguesta Lekav.
- Carex diandra f. longibracteata Chwast.
- Carex diandra f. major (W.D.J.Koch) Kük.
- Carex diandra f. tenella (C.L.Beckm.) Kük.
- Carex diandra var. ampla (L.H.Bailey) Kük.
- Carex diandra var. ramosa (Boott) Fernald
- Carex ehrhartiana Hoppe ex Boott
- Carex fulva Thuill.
- Carex paniculata var. diandra (Schrank) Fiori
- Carex paniculata var. minor Retz.
- Carex paniculata var. teretiuscula (Gooden.) Wahlenb.
- Carex paradoxa subsp. pseudoparadoxa (S.Gibson) K.Richt.
- Carex paradoxa subsp. teretiuscula (Gooden.) Wahlenb.
- Carex paradoxa var. pseudoparadoxa (S.Gibson) Nyman
- Carex pseudoparadoxa S.Gibson
- Carex teretiuscula Gooden.
- Carex teretiuscula f. simplicior Sanio
- Carex teretiuscula var. ampla L.H.Bailey
- Carex teretiuscula var. crassior Hartm.
- Carex teretiuscula var. ehrhartiana (Hoppe ex Boott) Nyman
- Carex teretiuscula var. major W.D.J.Koch
- Carex teretiuscula var. nana Gaudin
- Carex teretiuscula var. ramosa Boott
and 5 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.
- 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.