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.
The specimen a real sheet, in a real collection
- Herbarium
- The New York Botanical Garden
- Accession
- 01835343
- Filed as
- Polytrichum commune Hedw.
- Det. by
- G. L. Smith 1970-04-10
- Collected
- H. S. Irwin 1969-01-31
- Origin
- BR
- The sheet
- View the digitised specimen (CC BY 4.0)
A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.
Where it actually grows measured, from 1,962 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -16.2 °C | -6.7 °C | 3.4 °C |
| Warmest month, mean daily high | 16.3 °C | 21.7 °C | 30.2 °C |
| Annual rainfall | 586 mm | 996 mm | 2,336 mm |
| Rainfall in the driest quarter | 88 mm | 170 mm | 355 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 1,962 research-grade observations of Polytrichum commune 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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 65 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.
- Pogonatum madagassum (Hampe) A.Jaeger
- Polytrichum alpinum var. propinquum (R.Br.) I.Hagen
- Polytrichum assimile Hampe
- Polytrichum autranii Renauld & Cardot
- Polytrichum brachypelma Müll.Hal.
- Polytrichum buchananii Broth.
- Polytrichum cataractarum Müll.Hal.
- Polytrichum commune f. chalubinskii (Żmuda) Podp.
- Polytrichum commune f. falcifolium Warnst.
- Polytrichum commune f. fastigiatum (Wilson) H.A.Möller
- Polytrichum commune f. nigrescens (Warnst.) Podp.
- Polytrichum commune f. nigrescens (Warnst.) Albr.Rohn.
- Polytrichum commune f. uliginosum (Wallr.) Mönk.
- Polytrichum commune f. washingtonianum Grout
- Polytrichum commune subsp. cubicum Lindb.
- Polytrichum commune subsp. yuccifolium (Ehrh. ex Funck) Giacom.
- Polytrichum commune var. alatauense Paris
- Polytrichum commune var. brevifolium C.E.O.Jensen
- Polytrichum commune var. brevifolium Geh.
- Polytrichum commune var. brevirostre Papp
- Polytrichum commune var. canadense Kindb.
- Polytrichum commune var. chalubinskii Żmuda
- Polytrichum commune var. commune
- Polytrichum commune var. cubicum (Lindb.) I.Hagen
and 41 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.