Plate 1 figs. a–c · 1 observation
This species has been photographed under an open licence only 1 time, 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.
Native range 84 botanical countries
Not drawn on the map: Great Britain, Aleutian Is.. 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.
Flowering 239 in flower of 270 examined
Peak flowering in Nov. Each bar is the share of Gentianella amarella observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 239 of 270 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 6 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.
Where it actually grows measured, from 2,016 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -22.2 °C | -14.6 °C | 1.0 °C |
| Warmest month, mean daily high | 15.1 °C | 20.2 °C | 24.8 °C |
| Annual rainfall | 392 mm | 757 mm | 1,525 mm |
| Rainfall in the driest quarter | 40 mm | 110 mm | 258 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 2,016 research-grade observations of Gentianella amarella 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. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.
Also published as 172 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.
- Amarella acuta (Michx.) Lunell
- Amarella anisosepala (Greene) Greene
- Amarella californica Greene
- Amarella conferta Greene
- Amarella copelandii (Greene) Greene
- Amarella distegia (Greene) Greene
- Amarella gracilis Raf.
- Amarella hartwegii (Benth.) Arthur
- Amarella lemberti Greene
- Amarella mexicana (Griseb.) Arthur
- Amarella plebeia var. holmii Rydb.
- Amarella plebeja (Cham.) Greene
- Amarella quinquefida Gilib.
- Amarella revoluta Greene
- Amarella strictiflora (Rydb.) Greene
- Amarella tenuis (Griseb.) Greene
- Amarella theiantha Lunell
- Amarella theiantha var. lactea Lunell
- Amarella theiantha var. livida Lunell
- Comastoma acutum (Michx.) Y.Z.Zhao & Xin Zhang
- Ericala acuta G.Don
- Ericala flava G.Don
- Ericoila acuta (Michx.) G.Don
- Ericoila flava (J.Mayer ex Schult.) G.Don
and 148 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 GEAM3. public domain. 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.