Plate 1 figs. a–h · 6 observations
This species has been photographed under an open licence only 6 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 90 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -18.3 °C | -12.4 °C | -4.6 °C |
| Warmest month, mean daily high | 11.3 °C | 16.7 °C | 23.2 °C |
| Annual rainfall | 672 mm | 1,192 mm | 2,954 mm |
| Rainfall in the driest quarter | 102 mm | 213 mm | 482 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 90 research-grade observations of Ptychostomum weigelii 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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.
- Bryum duvalii Voit
- Bryum duvalii f. robustum I.Hagen
- Bryum duvalii subsp. sagittifolium (Culm.) Culm.
- Bryum duvalii var. glaciale Molendo & Lorentz
- Bryum duvalii var. latodecurrens Müll.Hal. & Kindb.
- Bryum duvalii var. obtusatum Cardot & Thér.
- Bryum duvalii var. robustum Röll
- Bryum duvalii var. sagittifolium (Culm.) Mönk.
- Bryum duvalii var. viride J.J.Amann
- Bryum flaccidissimum Cardot & Thér.
- Bryum leucobasis Kindb.
- Bryum pseudotriquetrum f. laxirete Podp.
- Bryum sagittifolium Culm.
- Bryum sphagni Brid.
- Bryum ventricosum var. duvalii (Voit) Hampe
- Bryum weigelii Biehler
- Bryum weigelii f. acutius Podp.
- Bryum weigelii f. krajinae Podp.
- Bryum weigelii f. leucobasis (Kindb.) Pilous
- Bryum weigelii f. obtusatum (Cardot & Thér.) Pilous
- Bryum weigelii f. robustum (Röll) Pilous
- Bryum weigelii f. sublimbatum Podp.
- Bryum weigelii f. viride (J.J.Amann) Pilous
- Bryum weigelii subsp. sagittifolium (Culm.) Podp.
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.
- USDA PLANTS Database. common name, checklist symbol BRWE70. public domain. 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.