Plate 1 figs. a–f · 4 observations
This species has been photographed under an open licence only 4 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.
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.
Where it actually grows measured, from 73 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -22.1 °C | -6.6 °C | 2.1 °C |
| Warmest month, mean daily high | 16.9 °C | 21.5 °C | 24.8 °C |
| Annual rainfall | 466 mm | 1,081 mm | 2,271 mm |
| Rainfall in the driest quarter | 55 mm | 175 mm | 440 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 73 research-grade observations of Calliergon giganteum 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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 46 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.
- Acrocladium giganteum (Schimp.) P.W.Richards & E.C.Wallace
- Amblystegium giganteum (Schimp.) De Not.
- Calliergon giganteum f. brevifolium (Limpr.) Mönk.
- Calliergon giganteum f. crassicostatum (Mikut.) Karczm.
- Calliergon giganteum f. decurrens (Mikut.) Karczm.
- Calliergon giganteum f. dendroides (Limpr.) Mönk.
- Calliergon giganteum f. falcatum (J.J.Amann) Podp.
- Calliergon giganteum f. fontinaloides Mönk.
- Calliergon giganteum f. giganteum
- Calliergon giganteum f. hystricosum (G.Roth & Bock) Podp.
- Calliergon giganteum f. immersum Mönk.
- Calliergon giganteum f. laxifolium (Warnst.) Podp.
- Calliergon giganteum f. pseudosarmentosum (Latzel) Podp.
- Calliergon giganteum f. robustum (Warnst.) C.E.O.Jensen
- Calliergon giganteum var. brevifolium (Limpr.) Warnst.
- Calliergon giganteum var. crassicostatum Mikut.
- Calliergon giganteum var. cyclophyllotum (Holz.) Grout
- Calliergon giganteum var. decurrens Mikut.
- Calliergon giganteum var. dendroides (Limpr.) G.Roth
- Calliergon giganteum var. falcatum J.J.Amann
- Calliergon giganteum var. fluitans G.Roth
- Calliergon giganteum var. giganteum
- Calliergon giganteum var. hystricosum G.Roth & Bock
- Calliergon giganteum var. immersum Warnst.
and 22 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.
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. It has no native range either: Kew's checklist does not cover this taxon.